Add support for NetConnection arguments to be passed on RTMFP multicast connections as well

First element in object vector params for MulticastResource will be
passed as argument to onConnect function of FMS.

Sample usage:

var vectorParams:Vector.<Object> = new Vector.<Object>();

vectorParams.push( { streamName: rtmfpStreamName
				   ,confUrl:"http://192.168.0.140/rtmfp/server-conf.json"
			          ,pollUrl: "http://192.168.0.140/rtmfp/server-poll.json"} );

// Create at MulticastResource to connect and manage the RTMFP
Multicast Connection: Requires URI, Group Specifier string, and stream
name
var multicastResource:MulticastResource = new MulticastResource(uri,
groupspec.toString(), rtmfpStreamName, vectorParams);
Add .gitignore file