Unused modules
Style
Persona login view should be POST only.
Add persona email to current-user view.
current-user view tweaking.
Remove unused code
CSRF Protection (relies on view in next commit)
Persona refactoring server side
Persona refactoring client side
User actions can may as well be unconditional now
Don't emit a new csrf token on checking.
Add JSON views for errors
Capitalize error messages.
Only login registered users.
Display error messages prettily
Remove href from link to avoid weird reload problems
Error messages for login.
Merge remote-tracking branch 'origin/master' into persona-refactor

Conflicts:
	src/encoded/static/modules/app.js
	src/encoded/static/modules/navbar.js
Log in / Log out -> Sign in / Sign out
Support multiple login buttons; tweak frontpage.