Remove shared_ptr from param_k_ and param_radius_

fixes segfault im lum
added missing documentation line, fixed typos in documentation
added comment, fixed typo in another comment
added possibility to split row and column jump for iterating over pixels, setTrianglePixelSize still available for setting both equally.
added PXC grabber code and cmake files
fixed earlier modification
fixed copy&paste error
Merge pull request #194 from jspricke/flann_shared_ptr

Remove shared_ptr from param_k_ and param_radius_
fixed some coding-standard issues and removed some commented code
removed some commented code
Merge pull request #240 from holzers/master

Added PXC Grabber (for Intel Perceptual Computing SDK cameras)
Create README.md
Merge pull request #229 from dirkholz/improved_approx_mesh

Slightly improved approx. meshing by allowing to use different offsets when iterating over rows and columns
Merge branch 'master' of https://github.com/PointCloudLibrary/pcl.git into LGPCLLocal