Python Wrapper via Swig

[rbharath]

There's a lot of boilerplate to generate when writing even simple homomorphic programs. Being able to experiment in Python would make the turnaround time on simple experiments much faster. Some simple Googling reveals that SWIG seems to be a good option for wrapping C++ libraries. Implement a functional SWIG wrapper for the classes here.

http://intermediate-and-advanced-software-carpentry.readthedocs.io/en/latest/c++-wrapping.html