API changes:
- Rename Commit._message to Commit.raw_message
- Rename Signature._name to Signature.raw_name
- Rename Signature._email to Signature.raw_email
New features:
- Remote.push(refspec)
- Tag.get_object()
And some bugs fixed.
Thanks to Brodie Rao, Fraser Tweedale, Andrew Chin and Carlos Martín
Nieto.