Site updates 0.121

0b5c2f5 Set up Browserify
832d7be Migrate some Bower components to Browserify (node_modules)
e02aed6 Fix variable name in spinner wrapper
f324141 Browserify ajax.js
1050a52 Extract Keys module
b5da283 AJAX -> Ajax
31e337d Rename JS modules for consistency
cd1c372 Clean up bower.json
ec19a31 Browserify git.js
03a1efe Import files from react subdirectory
0f72093 Style fixes
3bf8bd9 Use cx instead of by-hand class manipulation
50d7780 Use Keys module pervasively
c6d153a Tweak React modules for use in Rails context
bcf7fd5 Improve moderation email subject lines
7138041 Update bundle.js prior to deploy