Don't listen for post_delete on all models.

[sleepyjames]

Currently favourites registers to receive post_delete signal for all models. This should be configurable to allow you to only register for the models used. eg:

FAVOURITE_REGISTER_CLEANUP_FOR = ('foo_app.BarModel', 'bar_app.FooModel')

or something similar.

Or alternatively use a register pattern to register the models you want to use with favourites in the first place eg.

favourites.register(Foo)

This would add only allow a user to favour objects of class Foo and register to cleanup on Foo's post_delete

[dhilton]

Good idea on it.