android: add accessor for mMap

vtm-android/src/org/oscim/android/MapActivity.java

@@ -52,6 +52,10 @@ public abstract class MapActivity extends FragmentActivity {
 
 	protected Map mMap;
 
+	public Map map() {
+		return mMap;
+	}
+
 	@Override
 	protected void onDestroy() {
 		super.onDestroy();