+ability to skip updates

scripts/build.rb

@@ -117,8 +117,11 @@ def frameworks_routine(data)
     root = data["frameworks"][name]
     url = root["url"]
     min_only = root["min_only"]
+    skip = root["skip"]
+    if !skip
       update_css(name, url)
     end
+  end
   puts "  Update complete."
   puts
 end