Use 'json' instead of 'django.utils.simplejson' as it has been deprecated.
Remove unused imports.
Update example code for 'hook_event.send' in README.
Make sure we fire hooks for custom events as well.
SUGGESTION: Make 'user' an optional filter for the hook which is fired. If 'user' is not sent as a filter, and cannot be found, fire the event for all users/accounts that are subscribed to it.
Unpeg devrequirements for greater flexiblity for developers.
Fix tests.
Ignore 'user' for the hook if user_override=False.
Add new convention for user agnostic hooks.
Merging with master.
Merge branch 'fixes-and-updates'