Add support for SQLAlchemy 1.0.4
Add support for SQLAlchemy 1.0.4

This has been released and Gertty works with it.  A subsequent
change will accomodate SQLA 1.0.4-specific behavior.

Change-Id: I864c913354a8e69f0cfc68634c6ce081dce6eb3f

openstack/gertty,aspiers/gertty,stackforge/gertty