Fix issues with python2-django-extensions

Remove unnecessary license file from package. The downloaded .tar.gz file
already includes a license, so it is unnecessary to ship a copy of the license
in the package itself.

Add a script that prints the currently installed version of django-extensions.

Make pacakge depend upon python. (python version 3!) This silences a namcap
warning. Namcap was issuing the warning because several of the scripts installed
have a shebang that references python 3. Those scripts may actually be
compatiable with python 2, and it is possible to patch them by adding a
prepare() function. However, this should be verified by posting to the
django-extensions mailing list.