Merge pull request #1751 from iglesias/develop

Remove unused Python statement in metric learning notebook
drop get_*real* from director distance to fix compile error
Append USE_SWIG_DIRECTORS if it's set
bug reported by Taylan Ozgur Toygarlar
Add install target to RStatic interface in CMakeLists.txt
minor change
fix a bug in structure_factor_graph_model.py
Merge pull request #1753 from hushell/develop

fix a bug in structure_factor_graph_model.py
Fix matrix indexing in ClusteringMutualInformation
Fix libc++ compilation problems
aka fixes for OSX 10.9