Fixing tests that broke with the addition of idle_before_close.
Adding support for REDIS_URL when connecting.
REDIS_URL takes precedence over REDIS_HOST/REDIS_PORT when establishing a Redis client connection. Also, adding tests for this addition.
Updating README to include info about REDIS_URL in settings.py.
Fixing port numbers, s/6397/6379/g.
Merge pull request #12 from schmich/feature/redis_url

Add support for connecting to Redis with a URL