Fixing fatal packaging error (missing __init__.py)

Without __init__.py python fails to load the package after deploy.
Small explenation from pydoc:

https://docs.python.org/2/tutorial/modules.html
The __init__.py files are required to make Python treat the directories as containing packages; this is done to prevent directories with a common name, such as string, from unintentionally hiding valid modules that occur later on the module search path. In the simplest case, __init__.py can just be an empty file, but it can also execute initialization code for the package or set the __all__ variable, described later.
Adding local copy of MIT license for packaging

This makes it easier to properly package xortool
without having to pull in the license from outside
the tarball.

+ fixing old license declaration in header (GPL)
Unify "/usr/bin/env python" in xortool-xor