added calendar widget (needs color/styling update)
Adding HTML editing functions to competition edit page.

Conflicts:
	codalab/apps/web/forms.py
	codalab/apps/web/views.py
Added in leaderboard_management_mode for editing.

Conflicts:
	codalab/apps/web/forms.py
	codalab/apps/web/static/css/Main.css
	codalab/apps/web/views.py
Fixes for text area heights.
final updates for edit page

Conflicts:
	codalab/apps/web/forms.py
	codalab/apps/web/static/css/Main.css
Added tinyMCE
Fixing rendering HTML so it's consistent.
Updated options to enable full HTML editing
Fixed last description "|safe" I could find.
Removed extra <p> tags screwing up the editor.
Missing link to make html pages accessible from competition object.
Merge branch 'umaster'
Fixed missing comma
Merge branch 'master' into dev
Fix formatting issues in competition tiles.