Edit Quiz: Add ability to duplicate a question

Also including Font Awesome for icons
Show tooltips for question actions (Copy, Move, Delete)
Make buttons that use Font Awesome icons have a consistent size as buttons that use Glyphicon icons.
Add an "Ignore capitalization" checkbox for fill-in questions
Add support for alternate answers for fill-in questions
Temporarily remove node_nodules from gitignore to fix an issue with deploying to heroku