Support Trunk branching strategy

[nid90]

Closes #548

Updated version of #675

Missing from current implementation:

• A user can apply HEAD, HEAD~1, HEAD~n off the list of the commits that have landed on the working branch since the last tag cut. Or they can apply all the commits in the change queue.
• When the user applies a commit from the change queue, tag the applied commit with a patch version change on the release. So if the current version is 1.2.0, the last commit applied will make it 1.2.1.