Merge pull request #7 from opengm/RC2.1

Rc2.1
Merge pull request #8 from opengm/RC2.1

Rc2.1
Merge pull request #9 from opengm/RC2.1

Rc2.1
add grante wrapper code. requires c++11 and is that why experimental. Only experts should use it.
Merge pull request #82 from joergkappes/RC2.1

Grante Wrapper