Various changes, need to pull to continue development.
Merge branch 'master' of https://github.com/OkayHughes/RailsDisc into comments

Conflicts:
	app/views/comments/_comment.html.erb
	app/views/posts/_post.html.erb
Fixed pull conflicts.
Added comment reply system. Yet to add editing. May need to reconstruct
parts of comment system for that. Too tired at current.
Created Comment Updating
Ajaxified Comments (ugh. So many 2 hour bugs). Comments are almost
fully functional.
Decreased border radius, very slight
Added groups menu and made groups defined by comma separated list.
Groups aren't models. Just tags, essentially. Subject to change.