add euslisp image processing example from ROS iamge

[k-okada]

terminal 1 (start roscore)

roscore

terminal 2 (start camera driver, for example)

rosrun usb_cam usb_cam_node _video_device:=/dev/video0 _image_width:=320 _image_height:=240

terminal 3 (start sample code)

./image-processing.l image:=/usb_cam/image_raw