Depend upon the pre-release version of GitPython

The latest 'full' release is 0.1.7 which is way to old.
Version 0.2.2
Make shaker quieter by default
update symlinks to be relative (useful for vagrant salt provider)
Add a teeny-tiny amount of docs to Salt Shaker
Merge pull request #14 from ministryofjustice/relative_symlink

update symlinks to be relative (useful for vagrant salt provider)
spike vcloud
stub vcloud provisioning and add generic gateway support
docs
docs