Merge pull request #49 from DerThorsten/RC2.1

Rc2.1
Merge pull request #3 from opengm/RC2.1

Rc2.1
add FastPD and GCOLIB support, fix MQPBO-visitor bug
Merge pull request #51 from joergkappes/RC2.1

Rc2.1
add missing const in caller, shift matlabdependences in interface/matlab, remove callerdependence, add reduced inference
Merge pull request #55 from joergkappes/RC2.1

add missing const in caller, shift matlabdependences in interface/matlab...
add inf-and-flip inference-meta-solver
fix FastPD patch
Merge pull request #57 from joergkappes/RC2.1

Rc2.1
Merge branch 'RC2.1' of git://github.com/opengm/opengm into RC2.1