Gutter-django

- Fixed switch_condition_removed signal to pass ``switch`` instance.

- Updated signals to pass more useful information in each one (including the switch).

- The percent field is now available on all ModelConditionSet's by default.
- Fixed a CSRF conflict issue with Nexus.

- Added gutter.testutils.with_switches decorator
- Added gutter.testutils.SwitchContextManager

- Updated autodiscovery code to resemble Django's newer example
- Updated django-modeldict to 1.1.6 to solve a threading issue with registration
- Added GARGOYLE_AUTO_CREATE setting to disable auto creation of new switches
- Added the ability to pass arbitrary objects to the ifswitch template tag.

- Ensure HostConditionSet is registered