Nico von Geyso e402d0e9eb added head-getter for Repository
You do not have to lookup and resolve the HEAD reference anymore if you simply want
the last commit. Repository has now a head-getter which combines all these steps.

example:
  repo = Repository('.')
  head = repo.head
  print(head.message)
2012-05-28 12:41:43 +02:00
..
2012-05-28 12:41:43 +02:00