turned main into a command under the hood. fixes #21
added __about__ file for better version handling.

 see this for inspiration
http://www.jeffknupp.com/blog/2013/08/16/open-sourcing-a-python-project-the-right-way/

and see this issue for more info:
https://github.com/audreyr/cookiecutter-pypackage/issues/1
fixed the tests for the changed commandline interface