When adding reviews, star ratings can be entered
Added other files for star ratings
Star ratings added to comments, review pages etc.
Added better hints for star ratings
Merge remote-tracking branch 'origin/master' into star-ratings

Conflicts:
	openreview/apps/main/forms.py
	openreview/apps/main/templates/main/add_review.html
Show and allow star ratings only if review is not comment
Implemented categories for paper
Merge branch 'master' of https://github.com/open-review/open-review into feature-paper-categories
Added normalize submodule
Fixed tests
Added category functionality to ArXiv scraper
Added open-review-static (containing jQuery and fonts) submodule
Improved tests for reviewform
Fixed database structure, fixed unpredictable test failures
Star rating is now required when submitting new reviews
Fixed editing reviews
Fixed redirects (redirect to review instead of frontpage after saving)
Some fixes on deleting, adding, viewing and editing reviews and comments
Fixed editing comments
Added live previews for comments and reviews