Allow WS4REDIS_PROCESS_REQUEST to be a string
Allow WS4REDIS_PROCESS_REQUEST to be a string

refs #232

If WS4REDIS_PROCESS_REQUEST, the string is considered as a path and django.utils.module_loading.import_string (or import_by_path for older version) is used to do so.

jrief/django-websocket-redis,jrief/django-websocket-redis