Merge pull request #7 from opengm/RC2.1

Rc2.1
Merge pull request #80 from homul/RC2.1

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

Rc2.1
Merge pull request #81 from homul/RC2.1

bugfix for gcc 4.4 (maybe compiler-bug)
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
resolved clang compiler errors
Merge pull request #83 from hanslovsky/RC2.1

resolved clang compiler errors for test_dualdecomposition
Merge pull request #4 from opengm/RC2.1

Rc2.1