Associate tfs workitems with pattern #Workitem_id ( github style )

If Microsoft is doing it with TFS2013 and Git, why can't we do it!?!
cleaning/refactoring tests on checkin options (nothing scary)
export workitems with github/TFS '#' format to better support import in TFS(Git)
Merge pull request #483 from pmiossec/associate_workitem_github_style

Associate tfs workitems with pattern #Workitem_id ( github style )