1744 - Addressed WebSocket security error in IE10

When IE10 had more than 6 pages open on the same domain with WebSockets it would throw a SecurityError.  We now catch this error appropriately (and any others that might be thrown by a transport starting) and fallback appropriately.

I had to also expand the network mock library to allow for enabling/disabling the library so that I could test the native dom WebSocket element (need to test the original socket, not the modified one).

This was all to address Issue #1744