Added

• working PyPI and GitHub pip installs on both OSX and Linux
• wrapped the external Mersenne Twister C library to generate better random numbers for BPR/WARP training
• added a MANIFEST.in to include all C source and headers in the sdist archive

Changed

• changed the logic in setup.py to favor building extensions from the generated C source rather than re-cythonizing the .pyx files. This is best practice according to the Cython docs.
• removed Cython as a formal dependency as the generated C code will be included in the package sdist from now on.