Git version

[SuborbitalPigeon]

A command to print the git revision the current robot is using

[webpigeon]

6255d0e lays the groundwork for this, the build process now generates a git.properties file in the jar containing information about the git commit which generated the package.

[webpigeon]

I have had to move this to the release profile because travis-ci throws errors when it tries to perform the action as part of the build.