Some browsers may not support data channels (hi there, Edge!) and sometimes it
may not be desirable for other reasons.

* Get local user ID

How to get the id Participate local.

* Correction of the sequence of numbers

Ignores start audio/video muted requests received by jicofo.

Make sure there are options to set the extension ID and an enabled flag for
both Chrome and Firefox.

Removed checking for deprecated configuration options: desktopSharing,
chromeExtensionId and minChromeExtVersion.

By default talk while muted detection is disabled.

Jicofo is smart and can find any bridge with service discovery and/or
pubsub.