Django-unicorn

- Handle events on internal elements

- Fix: certain actions weren't triggering model values to get set correctly

- Loading states for improved UX.
- `$event` special argument for actions.
- `u` unicorn attribute.
- APPS setting for determining where to look for components.
- Add support for parent elements for non-db models.
- Fix: Handle if Meta doesn't exist for db models.

- Add much more elaborate support for dealing with Django models.

- Parse action args as Python objects
- Add javascript unit tests
- Stop and prevent modifiers on actions
- Defer modifier on model
- Add support for multiple actions
- Django setting to minimize the Javascript

Breaking changes
- Remove unused `unicorn_styles` template tag
- Use dash for poll timing instead of dot

Fixes
- Attempt to get the CSRF token from the cookie first before looking at the CSRF token.