Uncap testscenarios.

I'm pretty good with backwards compat, and the other libraries I
maintain are not capped which is inconsistent.

Change-Id: I517b6ed6b32ed334bfe54dd02d42f40395a95b9b
New fixtures release.

There is a new fixtures release out which fixes a critical bug
(missing testtools dep) and also makes replacing Popen easier to work
with.

Change-Id: Ife0c6d3ef77903040d797557ecb27e55e4a0f3e9
Add pystache

Pystache is used by os-apply-config which is graduating from
stackforge today.

Change-Id: Ie7d87810f6bdf3794dc1ccec07f136a66381ef1b
Ignore common files that should never be added.

These files should never be added to the repository, so should be
ignored as the will be created by commonly used editors.

Change-Id: I9698a4b91d18368def786d708df156eaf69a87a6