RTCMultiConnection-v1.3, bandwidth and direct messages

You can send direct messages like this:

connection.userid = 'muazkh';
connection.channels['muazkh'].send('hello Muaz!');

You can set bandwidth like this:

connection.bandwidth = {
audio: 50,
video: 256
}

or directly:

connection.bandwidth.audio  =50;
connection.bandwidth.video  =256;

Merging #31 and implemented #33