Fix copy paste errors from silpa_common

Signed-off-by: Vasudev Kamath <kamathvasudev@gmail.com>
Drop core.py and move logic to __init__.py
use pbr for packaging

Droped old style setup.py and use pbr which is much more intelligent and
smarter.

Signed-off-by: Vasudev Kamath <kamathvasudev@gmail.com>
Add README.rst