subcommands don't work in python3.6

[chrisamow]

The git_clone example - with the needed print() change (ok, maybe giveaway that it wasn't designed for python3 :) but the other options stuff does work!)

'git_clone.py -h' does not print anything

'git_clone.py commit' does not get to the commit method()

[reverbc]

The example in README.rst is not a complete one.

All you need is to add the following code at the bottom of sample code:

if __name__ == '__main__':
    GitClone()

or you can refer to the example code in examples folder.

I've tested in Python 3.6.1 without problem :)