Merge pull request #21 from opengm/RC-2.3

from rc2.3
Fixed bugs on python wrapper side:

	- unit tests work again (bug in python glue code has been fixed)
	- gm_manipulator bug fixed (gm has been unlocked)
removed couts/prints
started changelog for rc2.3
Merge pull request #205 from DerThorsten/master

fixed bugs in python wrapper