Fail if .vim directory is not manged by pivotal_workstation
Fail if .vim directory is not manged by pivotal_workstation

If you use vim before running pivotal_workstation, vim will create a
.vim directory, which git will refuse to take over.  Fixes Issue 246.

pivotal-sprout/sprout-osx-apps,wendorf/sprout-osx-apps,Yesware/sprout,1000Bulbs/pivotal_workstation,wendorf/sprout-osx-apps,Yesware/sprout,Yesware/sprout,webcoyote/pivotal_workstation,pivotal-sprout/sprout-osx-apps,webcoyote/pivotal_workstation,pivotal-sprout/sprout-osx-apps,1000Bulbs/sprout,wendorf/sprout-osx-apps,1000Bulbs/pivotal_workstation,webcoyote/pivotal_workstation,1000Bulbs/sprout