Added support for Redis host and port arguments

[benlong]

Updated server.js to accept --redisport and --redishost arguments.

Values are passed to listen(), and normalized to defaults. From here forwarded along through the application.

A minor 'refactorish' change: Events.client is no longer created inline. Instead publish inits channel which inits event with proper redis information.

We're using this in production today. I'm interested in feedback/drawbacks of the implementation. I have another patch that allows the use of Redis.namespace for namespaced redis instances.

[felipecsl]

+1 I need this to run juggernaut in rails test environment, which connects to redis in a different port :thumbsup:

[snovotny]

+1 this patch works well for connecting to a different host redis is running on

[redterror]

+1

[kebot]

+1

[barttenbrinke]

+1

[Narnach]

+1

[codenamev]

+1

[alexandre-mbm]

:+1: I was seeing exactly this here...