Bug 1036233 - Initialize the data member of BluetoothDevice. r=btian
Bug 1036233 - Implement pairing methods of Bluetooth API v2. r=btian, r=mrbkap

- Promise<void> pair(DOMString aAddress)
- Promise<void> unpair(DOMString aAddress)
- sequence<BluetoothDevice> getPairedDevices()
Bug 1036234 - Implement pairing event handlers of BluetoothAdapter. r=btian, r=mrbkap

- EventHandler ondevicepaired;
- EventHandler ondeviceunpaired;