put shebang on top, so file is executable as it is

[mdik]

really small change for improvement of usability

[bwrsandman]

Proper shebang should be #!/usr/bin/env python2

env is used to not break out of a virtualenv and python2 should be used if the code is not compatible with both python2 and python3

https://www.python.org/dev/peps/pep-0394/