added audience and theme field to event
some categories for events
added audience and theme to form, update doesnt work yet
merging with master changes
optimized wording
categories now actually update on edit
checkboxes slightly less of a eye sore
Merge remote-tracking branch 'upstream/master'

Conflicts:
	web/views/events.py
Merge pull request #99 from ercchy/master

Merging alja's changes with resolved conflict