Add git::subtree class to install git-subtree
Add some unit tests
Adding classes/facts to README
Merge pull request #1 from hunner/subtree

Adding classes/facts to README
Merge pull request #7 from mcanevet/subtree

Add git::subtree class to install git-subtree
Fix git_version fact
Merge pull request #13 from mcanevet/fix_git_version

Fix git_version fact