progrium/dokku — pull request #334 by plietar (2013-11-21 00:04:50+00:00)
Title: Add a version command.

The git tag/revision is saved when running "make install", and can be displayed using "dokku version".

The version shown is the output from `git describe --tags`.
This consists of the closest tag, the number of commits since, and the sha1 of the revision.