some unit/python tests take too long

[karlnapf]

They should run in less than a second, as unit tests. Even with debug mode enabled! (Thats mostly when one runs them). Good to get in shape before release I reference people who might be able to fix them, please update if you do. Thanks

libshogun

libshogun-neuralnets_deep_belief_network (and other deep network tests) @khalednasr

statistics_hsic @lambday

libshogun-so_multiclass_BMRM @iglesias

libshogun-library_mldatahdf5 @iglesias

libshogun-variational_approx_example @yorkerlin

python modular

python_modular-regression_cartree_modular @iglesias

[lambday]

I'm checking statistics_hsic one..

[karlnapf]

thanks!