added an onclose handler method

When a WSRequest closes, it will call onClose() on the appropriate
handler. This can be used to clear up any references to that request
that were being held by the handler
changed the in-page title to webrtc (not websocket)
added license to handlers
added license to exceptions
added license
restructuring the SWSS

moving the handlers into the main server package. Other handlers should
live within their own applications and not the SWSS itself.
tried a simple polyfill for the peer conn
expansive ignore list
removed an exuberance of exceptions

replaced them all with SWSSException