Merge pull request #32 from zgiles/absfix

Adding an abs() around the distance.

src/android/LocationUpdateService.java

@@ -483,7 +483,7 @@ public class LocationUpdateService extends Service implements LocationListener {
         if (isDebugging) {
             startTone("beep");
         }
-        float distance = location.distanceTo(stationaryLocation) - stationaryLocation.getAccuracy() - location.getAccuracy();
+	float distance = abs(location.distanceTo(stationaryLocation) - stationaryLocation.getAccuracy() - location.getAccuracy());
         
         if (isDebugging) {
             Toast.makeText(this, "Stationary exit in " + (stationaryRadius-distance) + "m", Toast.LENGTH_LONG).show();