[FIX] Package duplication with setuptools

Fix #185
Fix addons not found error with odoo.py after setup.py
Include addons in virtualenv site-packages egg directory
    env/lib/python2.7/site-packages/openerp-8.0alpha1-py2.7.egg/addons
Remove duplicate openerp directory at root of virtualenv
    env/openerp

Signed-off-by: Sandy Carter <sandy.carter@savoirfairelinux.com>