added worlds/HRP2JSKNT_drcsim_debris.world

See https://github.com/start-jsk/rtmros_gazebo/pull/127#issuecomment-56957286.

![screenshot_from_2014-09-26 22 29 11](https://cloud.githubusercontent.com/assets/6636600/4421167/41fb6ccc-4581-11e4-90ee-0f7e60fce392.png)