Avoid using `desired_ref` directly for Git
Avoid using `desired_ref` directly for Git

Use the exposed helper aptly called `version` instead of trying
to deal with the messy `desired_ref` which can sometimes be set
as `:control_branch` especially for people with newer Puppetfiles
and crazy branching strategies.

Closes voxpupuli/ra10ke#10.

tampakrap/r10k-rake-tasks,tampakrap/ra10ke