Fix: gulpfile fixes.
Users Administration.

Changed: Participants Administration is now Users Administration.
Little tweaks.

Added: Submit buttons are disabled on click.
Fix: User photos now are resized (with css, not the file) to 140x140 to support retina displays.
Added: Autofocus on "name" field on user form.
Categories Administration Fixes
Change: Users can't vote for themselves.
Change: Category name is more visual.
Added: Some CSS3 visual effects on users photos.
Change: Submit buttons now are disabled when the form is submitted.
Change: Added autocomplete=off in some forms.