Add Python support

[jonathanirvings]

Add a support to write problem specification in Python :)

While working with several people not from Indonesia, I found a couple of instances where people like to write testcase generator for some problems using Python. Quoting from someone (hiding the identity for now): "personally I code most of my generators in python. there's something comforting about not having to worry about overflow. and also python is simply more expressive, e.g., I can chain lots of itertools functions along with generators and tuple unpacking and stuff. it's an order of magnitude harder if I have to do it in C++"