Updated search for manage.py
Updated search for manage.py

Code taken from Heroku's python buildpack
https://github.com/heroku/heroku-buildpack-python/blob/master/bin/release

ywarezk/heroku-buildpack-geodjango,ephemerallabs/heroku-buildpack-python,cirlabs/heroku-buildpack-geodjango,dulaccc/heroku-buildpack-geodjango,cirlabs/heroku-buildpack-geodjango,resmio/heroku-buildpack-geodjango,TipWander/heroku-buildpack-geodjango,minichate/heroku-buildpack-ldap,nwkotto/geodjango-buildpack-with-geos,cirlabs/heroku-buildpack-geodjango,minichate/heroku-buildpack-ldap