fix #18: inverse the coding and shebang line

examples/manipulability/2d_manipulability.py

@@ -1,5 +1,5 @@
-# -*- coding: utf-8 -*-
 #!/usr/bin/env python
+# -*- coding: utf-8 -*-
 """Draw the 2D velocity and force manipulability ellipsoids on the end-effector of a 3-link planar manipulator.
 
 References:

examples/manipulability/com_dynamic_manipulability_tracking_with_balance.py

@@ -1,5 +1,5 @@
-# -*- coding: utf-8 -*-
 #!/usr/bin/env python
+# -*- coding: utf-8 -*-
 """Center of mass manipulability tracking
 
 Track the dynamic manipulability ellipsoid of the center of mass of a particular robot while keeping its balance.

examples/manipulability/com_manipulability_tracking.py

@@ -1,5 +1,5 @@
-# -*- coding: utf-8 -*-
 #!/usr/bin/env python
+# -*- coding: utf-8 -*-
 """Center of mass manipulability tracking
 
 Track the velocity manipulability ellipsoid of the center of mass of a particular robot. In this example, the robot

examples/manipulability/com_manipulability_tracking_with_balance.py

@@ -1,5 +1,5 @@
-# -*- coding: utf-8 -*-
 #!/usr/bin/env python
+# -*- coding: utf-8 -*-
 """Center of mass manipulability tracking
 
 Track the velocity manipulability ellipsoid of the center of mass of a particular robot while keeping its balance.