added media url for routing, and fixed the static and media path(actually I think media_root is useless here, because we will redirect connection on /media/* to a handler)
Merge branch 'appengine_support'

Conflicts:
	django_deployer/paas_templates/appengine/app.yaml

Added:
    * urls_appengine for default routes of serving media contents
    * fixed the url static of media