provide an entry_point for third party drivers
As far as I can see there is currently no way for a third party Database drivers to hook into peewees db_url functionality. 

It would be great if there was an extension mechanism, maybe similar to how SQLAlchemy does it (see http://sqlalchemy.readthedocs.org/en/latest/core/connections.html#registering-new-dialects) so that a user can install a third party driver via pip install and then use that in his application without changing any line of code except the db uri.
