Added event tags and event tag types.
Passing the tagtypes to the event_page view.
Adding the Tag model to the Event model.
Displaying the event tag data and constructing the model.
Updated Chosen to version 1.0.0.
Added reset-function to tag form.
Fixed select markup to properly submit tags.
Added code to parse the submitted tags, compare them to the current ones and delete/create as appropriate.
Better not toggle the tags form on submit as the tags data is then obsolete.
Added classes and some rules to hide those tag types that don't apply to the event type.
View now saves tags correctly.
Tag type selects now update correctly depending on the state of the event type select.
Merge branch 'eventtags'

Events can now be tagged. The event type determines which tag types are accessible on the edit interface.