Adding Venstar ColorTouch Thermostat and cross domain patch for HTTP server

The thermostat uses an HTTP interface, with the ip address of the thermostat. You need a WiFi "skyport" card and the firmware must be >=3.12 and Local API turned on in settings.
The cross domain patch just adds the OPTIONS http command and adds the Access-Control-Allow-Origin header, so certain browser's security allows the cross domain REST call.