Fix collapsing section behavior on profile

Adding this class informs the Bootstrap widget that the sections are
expanded when they are first rendered.
Include image file data when editing group

This was mistakenly omitted from the initial implementation of the group
edit form.
Rename contact_info to contact_name

The new name is a better reflection of the actual usage of the field.
Redirect to home page on logout
Merge pull request #209 from azavea/feature/jcw/logout-redirect

Redirect to home page on logout
Merge pull request #208 from azavea/feature/jcw/contact-info-to-contact-name

Rename contact_info to contact_name
Merge pull request #204 from azavea/fix/jcw/profile-sections-expanded-by-default

Fix collapsing section behavior on profile
Add get_absolute_url to Event

Idiomatic Django:
https://docs.djangoproject.com/en/1.7/ref/models/instances/#get-absolute-url
Remove destructive GET RSVP URL

After some discussion, and some research into how other sites deal with
carrying intentions through a login cycle I decided to remove the
special case, destructive GET request for RSVPing to events. This
simplifies the code and makes RSVPing to event work exactly like
following groups.
Don't hide controls when event list empties

fixes #190 on github
Remove unnecessary template logic

`UpdateUI()` updates the dom based on public/private, so setting the lock icon class in the template is redundant.
Remove unused variable
Fix transposed function names and indentation
Update selector (post-styling) to restore "disable" functionality
Restore user settings "Cancel" action

Per @jfrankl and the "Cancel" button on the user settings page should revert the data but stay on the page. This was in my original PR but somehow got deleted.
Add configurable filters to event_list
Extend event_list to support custom templates
Setup controls for group detail event list
Merge pull request #211 from RickMohr/privacy-ui-fixes

Privacy ui fixes
Merge pull request #200 from steventlamb/topic/group_event_controls

Topic/group event controls