Add TweetNaCl.js to the JavaScript section (#141)

* Add TweetNaCl.js to JavaScript section

* Add Nettle to the C section

* Remove Nettle because of duplication

README.md

@@ -284,6 +284,7 @@ A curated list of cryptography resources and links.
 - [PolyCrypt](https://github.com/polycrypt/polycrypt) - Pure JS implementation of the WebCrypto API.
 - [rusha](https://github.com/srijs/rusha) - High-performance pure-javascript SHA1 implementation suitable for large binary data, reaching up to half the native speed.
 - [sjcl](https://github.com/bitwiseshiftleft/sjcl) - Stanford JavaScript Crypto Library.
+- [TweetNaCl.js](https://github.com/dchest/tweetnacl-js) - A port of TweetNaCl / NaCl for JavaScript for modern browsers and Node.js.
 - [URSA](https://github.com/quartzjer/ursa) - RSA public/private key OpenSSL bindings for Node.