Add DestWndSetupCtrl.js where intital code is copied from StompSetupCtrl.js
Starting to work, but requiring tight coupling on data.dstSel property and onAccept listener/callback.
Changed from specific callback requirement to a published event handler for destlnation window events.
Got event generation/handling working for showing the destination selection dialog, and passing the destination as an argument in the event transmitted back to SearcherCtrlMap
Dead code elimination.
Removed necessity for typing 'private-channel-' in pusher channel setup dialog.  The controller maintains the unique name and prepends 'private-channel-' to it before subscribing or creatiing the url to send to new clients windows.