Altered setup.py - removed cb.py dependency
added wait for make process to finish
removed extra step of building a library
added check for installed cython version
clarified README and error messages in setup.py
removed voro++ sources from setup in favor of single voro++.cc file
Removed Cython dependency
Merge pull request #6 from ansobolev/master

convert to dependency-free python module, suitable for PyPI deployment.