OpenSRF Websockets JS library

OpenSRF Websockets JS library

The API for the websockets library is very similar to that of the
XHR/Translator library.  The primary differences are that there is
always 1 open websocket connection which manages all communication
(unless another socket is explicitly opened) and *all* communication is
required to be asyncronous.

To enable websockets by default, add this to the top of your script:

OpenSRF.Session.transport = OSRF_TRANSPORT_TYPE_WS;

Signed-off-by: Bill Erickson <berick@esilibrary.com>