NPC-399 Calculate location of numpy include path by calling
numpy.get_include(), storing the location in NTA_NUMPY_INCLUDE environment
variable temporarily.
Create $NUPIC_INSTALL/lib/python$PY_VERSION/site-packages if it doesn't exist
Merge pull request #267 from oxtopus/NPC-399-calculate_numpy_include

Calculate numpy include path dynamically
Merge remote-tracking branch 'upstream/master' into spcpp