Passing 'undefined' to createClient fails with >=0.12

[rwky]

Previously I could pass undefined variables to createClient and they'd be populated as the defaults. Since 0.12 null must be passed due to the === operator.

Should the old behaviour still work? If so it's an easy fix by changing to == in createClient

[wavded]

This is affecting connect-redis as well, perhaps others. Before, any undefined parameter would fill in the defaults for host and port depending on which was missing. Now it must be null and there isn't a way to just include the host (second arg) parameter (throws an error).