New features added, bugs fixed

Added link interceptor, catches links which shouldn't be available yet
on a production environment and shows a warning.

Added "clear fields" functionality so a user can remove all active
filters in one action.

Updated with Khris's latest styles, had to do various tweaks to the
HTML to get it working. Mostly in the mobile template.

Added correct overlay for media items, these would always show a play
button before, now shows play button for audio/video and a magnifying
glass for documents and pictures.

Fixed the search field input. Keyboard would not disappear after a
search on iPad. Put the input inside a form now, which fixes this.