DBManager.create_session can now take additional arguments
DBManager.create_session can now take additional arguments

It can take any arguments that Session() can take
Most important argument being: expire_on_commit=False
which makes it so we don't have to expunge everything when we commit
stuff to the database.

pajlada/pajbot,pajlada/tyggbot,gigglearrows/anniesbot,gigglearrows/anniesbot,pajlada/tyggbot,pajlada/tyggbot,pajlada/tyggbot,gigglearrows/anniesbot,pajlada/pajbot,pajlada/pajbot,pajlada/pajbot