Move code
Implement the SetDevVersion step.
Commit future version number, too
Rename SetDevVersion to SetFutureVersion
When you write the new version number, test what you did
Implement a couple rollbacks, though they don't run yet
Implement the GitPushTags step

It has a rollback(), but rollbacks still don't execute.
Fix bug: splitlines() takes no keyword arguments
Improve README. Say something when finished