Add new nodelet: region growing based multiple plane detection

Nodelet RegionGrowingMultiplePlaneSegmentation to detect multiple planes based on RegionGrowing.

* result
![screenshot_from_2014-11-04 22 46 25](https://cloud.githubusercontent.com/assets/40454/4900941/58d1b292-642d-11e4-976c-168ca68df3d2.png)

![screenshot_from_2014-11-04 22 45 49](https://cloud.githubusercontent.com/assets/40454/4900942/5fec7f8a-642d-11e4-9199-13a0f23aeddb.png)

* input
![screenshot_from_2014-11-04 22 46 09](https://cloud.githubusercontent.com/assets/40454/4900944/611d079e-642d-11e4-94b9-8741e03469b1.png)