extend xval nb
gridsearch and examples
added graphcuts python examples
added a notebook for RBMs and DBNs
add table + cleanups
Merge pull request #2440 from khalednasr/rbm_dbn_notebook

added a notebook for RBMs and DBNs
Modified MultilabelCLRModel and HieararchicalModel to correct implementation of init_primal_opt()
Merge pull request #2468 from abinashpanda/develop

Modified MultilabelCLRModel and HieararchicalModel
Merge pull request #2438 from Jiaolong/graphcut_python_example

added graphcuts python examples
Merge pull request #2390 from Saurabh7/xvalnb

extend xval nb
updated to latest data-checkout
fix for broken BAHSIC unit test on freebsd bot