Dynamically check which ref a branch was create from

[thataustin]

Right now, the user has to say, check all branches against some canonical remote/branch (say, origin/master) in each repository. This assumes that each branch in each repository was branch'd off of origin/master. Instead, the script should figure out which remote/branch a given branch was branch'd from when it was created and use that remote/branch when doing the comparison to find out how outdated a branch is.

[thataustin]

for reference: http://stackoverflow.com/questions/18277841/find-out-when-a-git-branch-was-created-not-the-first-commit-to-that-branch