Release 1.7

Release 1.6.1

Tag v1.6 release

Release notes for 1.5.2

D'oh

Update release date

Fix missing argument to activate_configs in rollback.

Merge pull request NixOS#383 from domenkozar/update-changelog

Release notes for 1.3.1

Add NixOS 15.09.505.7adab11 AMIs

Fix release date, today is the day...