Added Examples for PCL1.2 [Not Tested]

Ported examples from <http://pointclouds.org/documentation/tutorials/>.

However, these examples are only tested on PCL 1.6 + [libopenframeworks](https://github.com/echa/libopenframeworks) and not tested on ofxPCL(PCL 1.2) + native openFrameworks. The reason is that I am not familiar with Xcode and unfortunately, I cannot currently build native openFrameworks project with ofxBoost+ofxPCL on my OS X 10.6. Therefore, there are no Xcode project files, but I assume that they can be build with Xcode project file of example-empty since I didn't edit any header files in `src/` (except a bug in movingLeastSquares).

Also be careful that these examples require either <http://svn.pointclouds.org/data/tutorials/table_scene_lms400.pcd> or <https://code.ros.org/trac/ros-pkg/export/34074/stacks/point_cloud_perception/trunk/pcl/test/bun0.pcd> to be placed under `data/` folder.

Finally, I'm sorry that I branched examplePCL1.2 from master but sending pull request to develop.

Naoto