Django-unicorn

- Redirect from action method in component

- Fix encoding issue with default component template on Windows (https://github.com/adamghill/django-unicorn/issues/91)
- Fix circular import when creating the component (https://github.com/adamghill/django-unicorn/issues/92)

- $model special argument and decorator.
- $toggle special method.
- Support nested properties when using the set shortcut.
- Fix action string arguments that would get spaces removed inadvertently.

Breaking changes:
All existing special methods now start with a $ to signify they are magical. Therefore, refresh is now $refresh, reset is now $reset, and validate is now $validate.

- Use LRU cache for constructed components to prevent ever-expanding memory.
- Loosen `beautifulsoup4` version requirement.
- Fix bug to handle floats so that they don't lose precision when serialized to JSON.
- Fix bug to handle related models (ForeignKeys, OneToOne, etc) fields in Django models.

- Add support for passing `kwargs` into component
- Provide access to the current `request` in the component's methods

- Fix: Prevent Django CharField form field from stripping whitespaces when used for validation.
- Fix: Handle edge case that would generate a null exception.
- Fix: Only change loading state when an action method gets called, not on every event fire.