Apologies for the massive changes in the external API (that's my fault),
and for the terrible codename for this release (that's @tclem's fault).

The detailed overview for the major API changes can be found in the
commit at 72a3fe42.

Major new features in this release:

	- Real caching and refcounting on parsed objects
	- Real caching and refcounting on objects read from the ODB
	- Streaming writes & reads from the ODB
	- Single-method writes for all object types
	- The external API is now partially thread-safe
	- Improved reference handling
	- New method to list references
	- ZLib is now built-in
	- Improvements to the Revision Walker
	- Tons of bug fixes

Thanks to all the contributors who make this possible.

Signed-off-by: Vicent Marti <tanoku@gmail.com>