use setImmediate not nextTick
comment activity feed
notifications route

with various fixes
initial notifications logic
fix slate comment blockquoting
comment following button and info
Merge branch 'master' of git://github.com/discore/discore

Conflicts:
	routes/home-stream.js
	styles/components/slates.styl
	views/sections/nav-bar.js
	views/streams/comments.js
	views/streams/streams.js