Bluetooth LE: implemented cycling cadence and speed sensors.

Cadence is working while speed still requires the wheel size.

src/androidTest/java/de/dennisguse/opentracks/services/TrackRecordingServiceTestLocation.java

@@ -244,13 +244,8 @@ public class TrackRecordingServiceTestLocation {
             }
 
             @Override
-            public boolean isSensorDataSetValid() {
-                return true;
-            }
-
-            @Override
-            public SensorDataSet getSensorDataSet() {
-                return new SensorDataSet(1, 2);
+            public SensorDataSet getSensorData() {
+                return new SensorDataSet();
             }
         });