Fixed a default timeout problem - if no timeout was specified the default timeout specified in settings was not used.

Now, you have three choices:
1. no timeout is specified - the default timeout is used
2. timeout is specified and it's not False - the specified value is used
3. timeout is specified as False - no timeout is set for this key and it does not expire

encode/decode base64 - you can't throw direct pickles at redis-py, because it tries to treat them like unicode.

Client libraries are no longer included with redis, so updated README to point to the redis client library