FreeSWITCH-FS-7269

Add state change i/o hook to the core and change some spidermonkey behaviour.

The most important thing to check is you now must create a new session with a blank constructor:
s = new Session();
then call s.originate() with all the former args that were documented to be for the constructor
this will will return true or false to indicate if the call worked.

See below this sample code demonstrates all of the changes:

////////////////////////////////////////////////////////////////////////////////
function on_hangup(hup_session)
{
    console_log("debug", "HANGUP!!!! name: " + hup_session.name + " cause: " + hup_session.cause + "\n");
	//exit here would end the script so you could cleanup and just be done
	//exit();
}

//set the on_hangup function to be called when this session is hungup
session.setHangupHook(on_hangup);

//allocate a new b_session
var b_session = new Session();

//make a call with b_session.  If this fails, all we will be able to access is the b_session.cause attr
if (b_session.originate(session, "sofia/mydomain.com/888@conference.freeswitch.org")) {
	//Inform the scripting engine to automaticly hang this session up when the script ends
    b_session.setAutoHangup(true);
	//set the on_hangup function to be called when this session is hungup
    b_session.setHangupHook(on_hangup);	
	//bridge session with b_session
    bridge(session, b_session);
} else {
    console_log("debug", "Originate Failed.. cause: " + b_session.cause + "\n");
}
////////////////////////////////////////////////////////////////////////////////






git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4773 d0543943-73ff-0310-b7d9-9358b9ac24b2