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