remove sparse feature example since it were only tests
new unit tests for matrix
added test for equals
equals method and minor updates
dont allow transposed for subsetted features since it breaks tests
added a massive bunch of tests for subsets on sparse features
removed print
sped up test and reduce accuracy
Merge pull request #1244 from karlnapf/develop

Fix the failing sparse subset unit tests
python dist-packages is specific to debian derivatives

cf.
http://stackoverflow.com/questions/9387928/whats-the-difference-between-dist-packages-and-site-packages
this patch uses dist-packages only when the system returns debian or ubuntu
use init_shogun_with defaults rather
minor changes in log-det
conjugate-gradient solver added in log-det