Adding back in the ability to pass args
Merge pull request #22 from briarfox/python_fix

Adding back in the ability to pass args for python.py
Revert to use sys.stdin, sys.stdout instead of their double underscored
version, i.e. sys.__stdin__ and sys.__stdout__.

It seems Pythonista does not recognize the double underscored version
properly. No output will be displayed if they are used.