py3 compatibility change
allow files in pyGPG directory to be added
minor improvements in setup.py

* add classifiers
* add long_description
ignore build dir
remove version.py and use __init__ instead
pep 8 cleanup.

Authored by: Pavlos Ratis <dastergon@gentoo.org> (Fri 27 Dec 2013 07:57:37 AM PST)
Some modifications not used, some changed differently.
Remove unused snakeoil code.