diff --git a/config/application.rb b/config/application.rb
index df1b09e..beed0e4 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -1,19 +1,10 @@
 require File.expand_path('../boot', __FILE__)
 
-# Pick the frameworks you want:
-require "active_record/railtie"
-require "action_controller/railtie"
-require "action_mailer/railtie"
-# require "active_resource/railtie"
-require "sprockets/railtie"
-# require "rails/test_unit/railtie"
+require 'rails/all'
 
-if defined?(Bundler)
-  # If you precompile assets before deploying to production, use this line
-  Bundler.require(*Rails.groups(:assets => %w(development test)))
-  # If you want your assets lazily compiled in production, use this line
-  # Bundler.require(:default, :assets, Rails.env)
-end
+# Require the gems listed in Gemfile, including any gems
+# you've limited to :test, :development, or :production.
+Bundler.require(:default, Rails.env)
 
 require File.expand_path('../cfg', __FILE__)
 
@@ -23,16 +14,6 @@ module AsciiIo
     # Application configuration should go into files in config/initializers
     # -- all .rb files in that directory are automatically loaded.
 
-    # Custom directories with classes and modules you want to be autoloadable.
-    config.autoload_paths += %W(#{config.root}/lib)
-
-    # Only load the plugins named here, in the order given (default is alphabetical).
-    # :all can be used as a placeholder for all plugins not explicitly named.
-    # config.plugins = [ :exception_notification, :ssl_requirement, :all ]
-
-    # Activate observers that should always be running.
-    # config.active_record.observers = :cacher, :garbage_collector, :forum_observer
-
     # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
     # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
     # config.time_zone = 'Central Time (US & Canada)'
@@ -41,21 +22,8 @@ module AsciiIo
     # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
     # config.i18n.default_locale = :de
 
-    # Configure the default encoding used in templates for Ruby 1.9.
-    config.encoding = "utf-8"
-
-    # Configure sensitive parameters which will be filtered from the log file.
-    config.filter_parameters += [:password]
-
-    # Enable the asset pipeline
-    config.assets.enabled = true
-
-    # Version of your assets, change this if you want to expire all your assets
-    config.assets.version = '1.0'
-
-    config.action_mailer.default_url_options = { :host => CFG['EMAIL_HOST'] }
-
-    config.assets.initialize_on_precompile = false
+    # Custom directories with classes and modules you want to be autoloadable.
+    config.autoload_paths += %W(#{config.root}/lib)
 
     # Disable generation of helpers, javascripts, css, and view specs
     config.generators do |generate|
@@ -65,5 +33,3 @@ module AsciiIo
     end
   end
 end
-
-ActiveRecord::Base.include_root_in_json = false
diff --git a/config/boot.rb b/config/boot.rb
index 4489e58..3596736 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -1,5 +1,3 @@
-require 'rubygems'
-
 # Set up gems listed in the Gemfile.
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
 
diff --git a/config/environment.rb b/config/environment.rb
index 6c5be02..90d646c 100644
--- a/config/environment.rb
+++ b/config/environment.rb
@@ -1,5 +1,5 @@
-# Load the rails application
+# Load the Rails application.
 require File.expand_path('../application', __FILE__)
 
-# Initialize the rails application
+# Initialize the Rails application.
 AsciiIo::Application.initialize!
diff --git a/config/environments/development.rb b/config/environments/development.rb
index e0eb6a6..138933f 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -1,37 +1,29 @@
 AsciiIo::Application.configure do
-  # Settings specified here will take precedence over those in config/application.rb
+  # Settings specified here will take precedence over those in config/application.rb.
 
   # In the development environment your application's code is reloaded on
-  # every request.  This slows down response time but is perfect for development
+  # every request. This slows down response time but is perfect for development
   # since you don't have to restart the web server when you make code changes.
   config.cache_classes = false
 
-  # Log error messages when you accidentally call methods on nil.
-  config.whiny_nils = true
+  # Do not eager load code on boot.
+  config.eager_load = false
 
-  # Show full error reports and disable caching
+  # Show full error reports and disable caching.
   config.consider_all_requests_local       = true
   config.action_controller.perform_caching = false
 
-  # Don't care if the mailer can't send
+  # Don't care if the mailer can't send.
   config.action_mailer.raise_delivery_errors = false
 
-  # Print deprecation notices to the Rails logger
+  # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log
 
-  # Only use best-standards-support built into browsers
-  config.action_dispatch.best_standards_support = :builtin
+  # Raise an error on page load if there are pending migrations
+  config.active_record.migration_error = :page_load
 
-  # Do not compress assets
-  config.assets.compress = false
-
-  # Expands the lines which load the assets
+  # Debug mode disables concatenation and preprocessing of assets.
+  # This option may cause significant delays in view rendering with a large
+  # number of complex assets.
   config.assets.debug = true
-
-  # Raise exception on mass assignment protection for Active Record models
-  config.active_record.mass_assignment_sanitizer = :strict
-
-  # Log the query plan for queries taking more than this (works
-  # with SQLite, MySQL, and PostgreSQL)
-  config.active_record.auto_explain_threshold_in_seconds = 0.5
 end
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 2ce0485..b95ce93 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -1,69 +1,80 @@
 AsciiIo::Application.configure do
-  # Settings specified here will take precedence over those in config/application.rb
+  # Settings specified here will take precedence over those in config/application.rb.
 
-  # Code is not reloaded between requests
+  # Code is not reloaded between requests.
   config.cache_classes = true
 
-  # Full error reports are disabled and caching is turned on
+  # Eager load code on boot. This eager loads most of Rails and
+  # your application in memory, allowing both thread web servers
+  # and those relying on copy on write to perform better.
+  # Rake tasks automatically ignore this option for performance.
+  config.eager_load = true
+
+  # Full error reports are disabled and caching is turned on.
   config.consider_all_requests_local       = false
   config.action_controller.perform_caching = true
 
-  # Disable Rails's static asset server (Apache or nginx will already do this)
-  config.serve_static_assets = true
+  # Enable Rack::Cache to put a simple HTTP cache in front of your application
+  # Add `rack-cache` to your Gemfile before enabling this.
+  # For large-scale production use, consider using a caching reverse proxy like nginx, varnish or squid.
+  # config.action_dispatch.rack_cache = true
+
+  # Disable Rails's static asset server (Apache or nginx will already do this).
+  config.serve_static_assets = false
 
-  # Compress JavaScripts and CSS
-  config.assets.compress = true
+  # Compress JavaScripts and CSS.
+  config.assets.js_compressor = :uglifier
+  # config.assets.css_compressor = :sass
 
-  # Don't fallback to assets pipeline if a precompiled asset is missed
+  # Do not fallback to assets pipeline if a precompiled asset is missed.
   config.assets.compile = false
 
-  # Generate digests for assets URLs
+  # Generate digests for assets URLs.
   config.assets.digest = true
 
-  # Defaults to Rails.root.join("public/assets")
-  # config.assets.manifest = YOUR_PATH
+  # Version of your assets, change this if you want to expire all your assets.
+  config.assets.version = '1.0'
 
-  # Specifies the header that your server uses for sending files
+  # Specifies the header that your server uses for sending files.
   # config.action_dispatch.x_sendfile_header = "X-Sendfile" # for apache
-  config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for nginx
+  # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for nginx
 
   # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
   # config.force_ssl = true
 
-  # See everything in the log (default is :info)
-  # config.log_level = :debug
+  # Set to :debug to see everything in the log.
+  config.log_level = :info
+
+  # Prepend all log lines with the following tags.
+  # config.log_tags = [ :subdomain, :uuid ]
 
-  # Use a different logger for distributed setups
-  # config.logger = SyslogLogger.new
+  # Use a different logger for distributed setups.
+  # config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)
 
-  # Use a different cache store in production
-  config.cache_store = :dalli_store
+  # Use a different cache store in production.
+  config.cache_store = :mem_cache_store
 
-  # Enable serving of images, stylesheets, and JavaScripts from an asset server
+  # Enable serving of images, stylesheets, and JavaScripts from an asset server.
   # config.action_controller.asset_host = "http://assets.example.com"
 
-  # Precompile additional assets (application.js, application.css, and all non-JS/CSS are already added)
+  # Precompile additional assets.
+  # application.js, application.css, and all non-JS/CSS in app/assets folder are already added.
   config.assets.precompile += %w( player.css player.js main_worker.js embed.css embed.js )
 
-  config.action_mailer.delivery_method = :sendmail
-
-  # Disable delivery errors, bad email addresses will be ignored
+  # Ignore bad email addresses and do not raise email delivery errors.
+  # Set this to true and configure the email server for immediate delivery to raise delivery errors.
   # config.action_mailer.raise_delivery_errors = false
 
-  # Enable threaded mode
-  # config.threadsafe!
-
   # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
-  # the I18n.default_locale when a translation can not be found)
+  # the I18n.default_locale when a translation can not be found).
   config.i18n.fallbacks = true
 
-  # Send deprecation notices to registered listeners
+  # Send deprecation notices to registered listeners.
   config.active_support.deprecation = :notify
 
-  config.action_dispatch.rack_cache = {
-    :metastore    => Dalli::Client.new,
-    :entitystore  => 'file:tmp/cache/rack/body',
-    :allow_reload => false
-  }
-  config.static_cache_control = "public, max-age=2592000"
+  # Disable automatic flushing of the log to improve performance.
+  # config.autoflush_log = false
+
+  # Use default logging formatter so that PID and timestamp are not suppressed.
+  config.log_formatter = ::Logger::Formatter.new
 end
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 780d39e..238899b 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -1,42 +1,36 @@
 AsciiIo::Application.configure do
-  # Settings specified here will take precedence over those in config/application.rb
+  # Settings specified here will take precedence over those in config/application.rb.
 
   # The test environment is used exclusively to run your application's
-  # test suite.  You never need to work with it otherwise.  Remember that
+  # test suite. You never need to work with it otherwise. Remember that
   # your test database is "scratch space" for the test suite and is wiped
-  # and recreated between test runs.  Don't rely on the data there!
+  # and recreated between test runs. Don't rely on the data there!
   config.cache_classes = true
 
-  # Configure static asset server for tests with Cache-Control for performance
-  config.serve_static_assets = true
-  config.static_cache_control = "public, max-age=3600"
+  # Do not eager load code on boot. This avoids loading your whole application
+  # just for the purpose of running a single test. If you are using a tool that
+  # preloads Rails for running tests, you may have to set it to true.
+  config.eager_load = false
 
-  # Log error messages when you accidentally call methods on nil
-  config.whiny_nils = true
+  # Configure static asset server for tests with Cache-Control for performance.
+  config.serve_static_assets  = true
+  config.static_cache_control = "public, max-age=3600"
 
-  # Show full error reports and disable caching
+  # Show full error reports and disable caching.
   config.consider_all_requests_local       = true
   config.action_controller.perform_caching = false
 
-  # Raise exceptions instead of rendering exception templates
+  # Raise exceptions instead of rendering exception templates.
   config.action_dispatch.show_exceptions = false
 
-  # Disable request forgery protection in test environment
-  config.action_controller.allow_forgery_protection    = false
+  # Disable request forgery protection in test environment.
+  config.action_controller.allow_forgery_protection = false
 
   # Tell Action Mailer not to deliver emails to the real world.
   # The :test delivery method accumulates sent emails in the
   # ActionMailer::Base.deliveries array.
   config.action_mailer.delivery_method = :test
 
-  # Use SQL instead of Active Record's schema dumper when creating the test database.
-  # This is necessary if your schema can't be completely dumped by the schema dumper,
-  # like if you have constraints or database-specific column types
-  # config.active_record.schema_format = :sql
-
-  # Print deprecation notices to the stderr
+  # Print deprecation notices to the stderr.
   config.active_support.deprecation = :stderr
-
-  # Raise exception on mass assignment protection for Active Record models
-  config.active_record.mass_assignment_sanitizer = :strict
 end
diff --git a/config/initializers/filter_parameter_logging.rb b/config/initializers/filter_parameter_logging.rb
new file mode 100644
index 0000000..4a994e1
--- /dev/null
+++ b/config/initializers/filter_parameter_logging.rb
@@ -0,0 +1,4 @@
+# Be sure to restart your server when you modify this file.
+
+# Configure sensitive parameters which will be filtered from the log file.
+Rails.application.config.filter_parameters += [:password]
diff --git a/config/initializers/inflections.rb b/config/initializers/inflections.rb
index 9e8b013..ac033bf 100644
--- a/config/initializers/inflections.rb
+++ b/config/initializers/inflections.rb
@@ -1,10 +1,16 @@
 # Be sure to restart your server when you modify this file.
 
-# Add new inflection rules using the following format
-# (all these examples are active by default):
-# ActiveSupport::Inflector.inflections do |inflect|
+# Add new inflection rules using the following format. Inflections
+# are locale specific, and you may define rules for as many different
+# locales as you wish. All of these examples are active by default:
+# ActiveSupport::Inflector.inflections(:en) do |inflect|
 #   inflect.plural /^(ox)$/i, '\1en'
 #   inflect.singular /^(ox)en/i, '\1'
 #   inflect.irregular 'person', 'people'
 #   inflect.uncountable %w( fish sheep )
 # end
+
+# These inflection rules are supported but not enabled by default:
+# ActiveSupport::Inflector.inflections(:en) do |inflect|
+#   inflect.acronym 'RESTful'
+# end
diff --git a/config/initializers/secret_token.rb b/config/initializers/secret_token.rb
index 213ff85..545a310 100644
--- a/config/initializers/secret_token.rb
+++ b/config/initializers/secret_token.rb
@@ -1,9 +1,12 @@
 # Be sure to restart your server when you modify this file.
 
-# Your secret key for verifying the integrity of signed cookies.
+# Your secret key is used for verifying the integrity of signed cookies.
 # If you change this key, all old signed cookies will become invalid!
+
 # Make sure the secret is at least 30 characters and all random,
 # no regular words or you'll be exposed to dictionary attacks.
+# You can use `rake secret` to generate a secure secret key.
 
-# set secret token from the config object and use a default one for development
-AsciiIo::Application.config.secret_token = CFG['SECRET_TOKEN'] || '21deaa1a1228e119434aa783ecb4af21be7513ff1f5b8c1d8894241e5fc70ad395db72c8c1b0508a0ebb994ed88a8d73f6c84e44f7a4bc554a40d77f9844d2f4'
+# Make sure your secret_key_base is kept private
+# if you're sharing your code publicly.
+AsciiIo::Application.config.secret_key_base = CFG['SECRET_TOKEN'] || '21deaa1a1228e119434aa783ecb4af21be7513ff1f5b8c1d8894241e5fc70ad395db72c8c1b0508a0ebb994ed88a8d73f6c84e44f7a4bc554a40d77f9844d2f4'
diff --git a/config/initializers/session_store.rb b/config/initializers/session_store.rb
index 61cc617..7a3a90a 100644
--- a/config/initializers/session_store.rb
+++ b/config/initializers/session_store.rb
@@ -1,8 +1,3 @@
 # Be sure to restart your server when you modify this file.
 
-AsciiIo::Application.config.session_store :cookie_store, :key => '_ascii_io_session'
-
-# Use the database for sessions instead of the cookie-based default,
-# which shouldn't be used to store highly confidential information
-# (create the session table with "rails generate session_migration")
-# AsciiIo::Application.config.session_store :active_record_store
+AsciiIo::Application.config.session_store :cookie_store, key: '_ascii_io_session'
diff --git a/config/initializers/wrap_parameters.rb b/config/initializers/wrap_parameters.rb
index 5fe232e..33725e9 100644
--- a/config/initializers/wrap_parameters.rb
+++ b/config/initializers/wrap_parameters.rb
@@ -1,10 +1,14 @@
 # Be sure to restart your server when you modify this file.
-#
+
 # This file contains settings for ActionController::ParamsWrapper which
 # is enabled by default.
 
 # Enable parameter wrapping for JSON. You can disable this by setting :format to an empty array.
 ActiveSupport.on_load(:action_controller) do
-  wrap_parameters :format => [:json]
+  wrap_parameters format: [:json] if respond_to?(:wrap_parameters)
 end
 
+# To enable root element in JSON for ActiveRecord objects.
+# ActiveSupport.on_load(:active_record) do
+#  self.include_root_in_json = true
+# end
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 179c14c..0653957 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -1,5 +1,23 @@
-# Sample localization file for English. Add more files in this directory for other locales.
-# See https://github.com/svenfuchs/rails-i18n/tree/master/rails%2Flocale for starting points.
+# Files in the config/locales directory are used for internationalization
+# and are automatically loaded by Rails. If you want to use locales other
+# than English, add the necessary files in this directory.
+#
+# To use the locales, use `I18n.t`:
+#
+#     I18n.t 'hello'
+#
+# In views, this is aliased to just `t`:
+#
+#     <%= t('hello') %>
+#
+# To use a different locale, set it with `I18n.locale`:
+#
+#     I18n.locale = :es
+#
+# This would use the information in config/locales/es.yml.
+#
+# To learn more, please read the Rails Internationalization guide
+# available at http://guides.rubyonrails.org/i18n.html.
 
 en:
   hello: "Hello world"