Opencv2 Overlay in Groovy using Catkin [closed]

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I want to modify OpenCV code in Groovy. I used these http://ros.org/wiki/catkin/Tutorials/workspace_overlaying (instructions). In a terminal I typed the following lines:

1) roscd opencv2

2) pwd Terminal shows "/opt/ros/groovy/share/opencv2$" as it should

3) mkdir -p ~/overlay_ws

4) cd ~/overlay_ws

5) mkdir -p ~/overlay_ws/src

6) cd ~/overlay_ws/src

7) wstool init

8) wstool set opencv2 --git git://github.com/Itseez/opencv.git

9) wstool update

10) source /opt/ros/groovy/setup.bash

11) cd ~/overlay_ws/

12) catkin_make

13) source ~/overlay_ws/devel/setup.bash

14) roscd opencv2

15) pwd Terminal still shows "/opt/ros/groovy/share/opencv2" instead of "~/overlay_ws/src/opencv2..."

What I'm I doing wrong?

Dave