added BeaconDevice Interface

library/src/main/java/uk/co/alt236/bluetoothlelib/device/beacon/BeaconDevice.java

@@ -0,0 +1,8 @@
+package uk.co.alt236.bluetoothlelib.device.beacon;
+
+/**
+ *
+ */
+public interface BeaconDevice {
+    BeaconType getBeaconType();
+}

library/src/main/java/uk/co/alt236/bluetoothlelib/device/beacon/ibeacon/IBeaconDevice.java

@@ -4,10 +4,11 @@ import android.bluetooth.BluetoothDevice;
 import android.os.Parcel;
 
 import uk.co.alt236.bluetoothlelib.device.BluetoothLeDevice;
+import uk.co.alt236.bluetoothlelib.device.beacon.BeaconDevice;
 import uk.co.alt236.bluetoothlelib.device.beacon.BeaconType;
 import uk.co.alt236.bluetoothlelib.device.beacon.BeaconUtils;
 
-public class IBeaconDevice extends BluetoothLeDevice {
+public class IBeaconDevice extends BluetoothLeDevice implements BeaconDevice{
 
     /**
      * The m iBeacon data.
@@ -75,6 +76,11 @@ public class IBeaconDevice extends BluetoothLeDevice {
                 getRunningAverageRssi());
     }
 
+    @Override
+    public BeaconType getBeaconType() {
+        return BeaconType.IBEACON;
+    }
+
     /**
      * Gets the calibrated TX power of the iBeacon device as reported.
      *