Use terminal-notifier instead.

You can activate an app when clicking a notification, and growlnotify was flakey about actually
showing the notification.
Add PYTHONPATH just in case.
Add some fancy less options.
Remove some unnecessary known types; use type-add for new types.
Spaces for indentation.
ignorecase for commands and refs.

This lets you type things like `git show head` without git complaining. This is default on some
systems, like OS X, but it should be explicit so it's the same everywhere.