Use a PEP-440 dev version instead of snapshot-.

This will hopefully fix travis during dev periods.

Change-Id: I63b33c33999a09cc3e52c6cba6b31292b13960e7
Release 1.2.1.

Change-Id: Ie05e2bb7da0a37c4e04c8f35a1d82f587aca2bb2
Fix skipping setUpClass with self.skipException

Change-Id: I1f314c91c4e852edafabc7cf3d2b01abe8a62fa3