py3 compatibility, typos/small bugs and added setup.py (for pip install)

[dcferreira]

No description provided.

[townie]

Hey python 3 support is awesome. I would recommend switching the xrange stuff to import error approach:

try:
    xrange
except NameError:
    xrange = range

Also, the tutorial notebook is still in python 2.

[negrinho]

@townie expect significant updates in about a month or so. We are working on improving the expressive power of the current implementation. The tutorial will significantly change by then. We are working on Python3 support too.