Fixed bug where users are removed from admin managed groups if the group name is not in the shib session.

users (i.e., LV-EM MOU partners). Group names in the settings file,
as well as an external access tagname are used to control access.

- auth middleware to add/remove user to/from control room group based on IP.
- new model for operator signoffs (event, instrument unique_together)
- form to create, edit, and delete the operator signoff object
- eventlog messages for changes to signoff objects.
- OperatorSignoff serializer and LVAlert message
- alert operator of outstanding events on landing page.
- new labels and migration
- Added logic to create/remove H1OK, H1NO, etc. labels.
- Exposing the OperatorSignoff List resource through REST interface (GET only).

Changes to improve speed of searches:
- remove neighbors from search by default
- select related objects for queryset in flexigrid response

- Removed south from installed apps.
- Moved migrations to south_migrations.
- Added new migrations directories.
- MIGRATION_MODULES setting.
- Added initial migrations
- Added TEST_RUNNER setting.
- Updated wsgi file.
- Changed mimetype arg in HttpResponse to content_type.

sending to the lvalert_overseer server, and then
fails over to lvalert_send.

Added ALERT_XMPP_SERVER settings so we can easily keep test instances sending to jabber instead of lvalert.

and was originally motivated by problems with the presentation of the EMBB.
At a basic level, the page obtains information about the Event log messages
and EMBB logs via AJAX calls to the server. This information is fed into
dgrid tables. Extensive use is made of the 'put-selector' to create DOM
elements. This approach eliminates the need for JavaScript code and django
template loops that build HTML. As not all of the features are correct in
Linux browsers (Konqueror, Iceweasel) more work needs to be done.