Datetime fields with timezone
It is fairly straightforward to add support for custom fields: http://peewee.readthedocs.org/en/latest/peewee/models.html#creating-a-custom-field

I also added a `DateTimeTZField` to the `playhouse.postgres_ext` module.
 Awesome, thanks!

This might be just me, but I cannot seem to be able to create DateTime fields with a timezone under Postgres. The [docs](http://www.postgresql.org/docs/9.1/static/datatype-datetime.html) state tacking on "with time zone" to the field spec should do it, but I haven't been able to figure out how to specify that in a Peewee model successfully.

Could you please check if that is possible and, if so, add an example for that to ReadTheDocs?

Thanks!
