Moved camouflage.py into package directory

Earlier the python module was in the project directory which is now its
own package directory 'camouflage'. Other minor changes include:

 * Created __init__.py in Camouflage directory

 * Added __pycache__ to .gitignore
Separated runner function from camouflage.py

Now the runner function (main() in camouflage.py) is in __main__.py