Add full redis url support instead of options

[puzrin]

https://github.com/NodeRedis/node_redis#rediscreateclient

[redis:]//[user][:password@][host][:port][/db-number][?db=db-number[&password=bar[&option=value]]]

It's common case to store connection params in config as single string. It would be nice if faye-redis-node understand such format (as redis 2.5+ driver).