Hi all,
First off apologies for the spam, but I thought it may be useful for a few git users out there.
I have put together a git plugin for easy Semantic Versioning (http://semver.org). It comes with its own plugin architecture to allow you to check project files have been updated with correct version number before applying a version tag (e.g. Android manifest, Apps Engine app.yaml etc.)
The project, install instructions etc. can be found here:
https://github.com/markchalloner/git-semver#readme
I have tested on Windows (MinGW) and Linux (Ubuntu 12.04) and in theory should work on OSX (maybe some kind user could test for me?)
I hope its of some use.
Regards Mark