Added a basic modal with text databinding to the Submission page.
Click to add new comment text.  Also added files for comment directive (still to be completed).
Created custom directive for comments.
Comments now editable
Comments now associated with lines.
Styling for comments
add ui-bootstrap
clean style, rename CommentModalCtrl to be compliant with idioms
Fixed bug when line already contains comment.  Modal now displays old comment by default.
Merge branch 'comments-modal' of github.com:cs198/codepuppy into comments-modal

Conflicts:
	app/assets/app/pages/submission/SubmissionCtrl.js
Merge pull request #30 from cs198/comments-modal

Comments modal