Add OpenGM based inference :)
hack rescaling of psi so we can get make our crammer-singer SVM with class-weight equivalent to the LinearSVC one.
test some stuff for openGM
implement batch_psi for rescale_C=True
utility function to compute energy, more iterations for ad3, get solver status
option for solvers in opengm, return energy in all inference methods
FIX EdgeFeatureGraphCRF with no symmetric or antisymmetric features.
Fixes to cache heuristic as in BMVC
minor fixes and optimizations for tests