add new plugin: BoundingBoxArray for jsk_pcl_ros/BoundingBoxArray

new plugin to visualize `jsk_pcl_ros/BoundingBoxArray`

![screenshot_from_2014-05-24 01 47 51](https://cloud.githubusercontent.com/assets/40454/3069344/7259b9a4-e29a-11e3-8df7-686cf0eddf9d.png)