Paper page is now responsive
Header and footer are now responsive
Paper listings are now responsive
Add paper form is now responsive
Splash page is now responsive
Login and Register page are now responsive
Fixed tests
Small fixes
Merge branch 'feature-responsive-2'

Conflicts:
	openreview/apps/papers/static/papers/css/paper.css
	openreview/apps/papers/templates/papers/paper.html
	static/css/splash.css
	templates/base.html