Latest bluecove lib, support multiple bt devices

-Added latest snapshot of bluecove libraries
-Switched from bluecove-gpl to bluecove-bluez for dbus support under
Linux
--Connections will now be faster established, because we can access
cached bt devices via dbus.
-Now, multiple devices with multiple connections are supported.
-Stable connection start/stop in Android app
Using bt adress instead of name for identifing connections