Update rails to 4.0.4.
Update gems.
Prefix browsee-related javascript.

--HG--
rename : lib/assets/javascripts/moe-legacy/url-hash.js => lib/assets/javascripts/moe-legacy/browser-url-hash.js
extra : amend_source : 68b7a7c888bccaf2f50910c6676f01814688fc03
Remove unused js.
Reenable GC when not in production.
Migrate related_tags to jquery.

Now with more coffeescript since debugging is now fun.
Many thanks to coffee-rails-source-maps and related projects.

--HG--
extra : amend_source : ca6574c9de67edf063d44cbd4857367d4ee853b4