The VCS storage backends are all mostly working now.

The VCS storage backends are all mostly working now.

Running
  python test.py libbe.storage.vcs
yields some EmptyCommit problems, an issue with bzr revision ids, and
some trouble with git's remove(), but nothing too critical.

On the bright side, now
  ./be list
Detects and uses the bzr backend :).

Onwards to moving over the remaining commands...