Merge pull request #62 from DerThorsten/RC2.1

Rc2.1
Merge pull request #4 from opengm/RC2.1

Rc2.1
bugfix GCOLIB patch
Merge pull request #63 from joergkappes/RC2.1

GCO-Patch bugfix
... Currently 3 Tests fail, I will have a look next ...
Merge branch 'RC2.1' of git://github.com/opengm/opengm into RC2.1
hdf5 hotfix