Release process

See if there are any PRs worth squeezing into release.
Go through the changes since last release, add them to changelog.
Add any new authors to the AUTHORS file.
Bump version for release
Open PR against develop with these changes.
Once the above PR is merged, open a PR against master with the changes from develop
Add a commit on that PR for updating the .sha256 files
Once the PR against master is merged, update shasums on README on the develop branch
Open a PR against salt with the new stable release.
Open a PR against kitchen-salt with the new stable release.