Add support for 20 and 64 noded heaxedrons
Better documentation (now on ReadTheDocs) and installation alternative
Tweak MANIFEST.in so documentation is included (tagged so version is pretty)
Tweak setup.py (tagged so version is pretty)
Mention CB-Geo in README.md (tagged so version is pretty)
Better structure and many other changes
Bug on mass corrected
Better pip installation
Initial version