Rqt 3d plot

3d plotter like nakanish-viewer

http://youtu.be/CDIwalbDmzw

* implemented as rqt widgets
* you can call this plotter by `rosrun jsk_rqt_plugins rqt_plot_3d`

![screenshot_from_2014-05-03 02 39 45](https://cloud.githubusercontent.com/assets/40454/2865820/6871e90e-d221-11e3-890f-24086cbd149d.png)