Add NixOS 15.09.505.7adab11 AMIs
Fix release date, today is the day...
Update 1.1.1 release date
Set higher memory for coordinator in hetzner backend test.
Update version. Add release notes for next minor version.
Fix the test
Python packages need to be propagated.
Distutils has no way to specify runtime dependencies, so we have to do it in the nixexpr.