Publish checker board polygon

* publish checker board region as jsk_pcl_ros/PolygonArray
* You can visualize it by jsk_rviz_plugins

![screenshot_from_2014-10-25 15 28 22](https://cloud.githubusercontent.com/assets/40454/4778996/96c51244-5c10-11e4-876c-3eb96a53e1a5.png)