Support GATT services over BR/EDR.

Preview at https://rawgit.com/WebBluetoothCG/web-bluetooth/support-bredr/index.html

@armansito
OK. We should then definitely mention this. I think overall, this isn't so bad since this same API framework might be extended to non-LE cases in the future, BUT we should say that if an app provides the UUID of a service that is found on the device that isn't a GATT service, then there isn't anything the app can do with it using this API other than know about it.