NURBS fitting: fixed trimming curve for surface fitting (parameter was wrong)
Cleaned up code in B-spline fitting example;
Added tutorial for trimmed B-spline fitting
added saving of trimmed bsplines, added viewer for trimmed bsplines, added saving of bspline in bspline fitting tutorial
Bspline tutorial: reviewed tutorial and added it to the index
Merge pull request #518 from tmoerwald/master

Tutorial "Fitting trimmed B-splines to unordered point clouds"
Corrected typo in octree.doxy
Corrected typos in features.doxy
Corrected typos in sample_consensus.doxy
Fix of broken links in sample_consensus.doxy
Corrected typo in keypoints.doxy
Fixed broken link to the picture in the surface.doxy
Addition of SACMODEL_CIRCLE3D and SACMODEL_CONE links and descriptions
Deleted the version number of PCL in sample_consensus.doxy
Merge pull request #525 from Logrus/tmp

Fixes of broken links in sample_consensus.doxy and some typos
crude pipeline plumbing
get the pipeline compiling with latest upstream, update copyright
remove the old passthrough implementation, but add passthrough as a dependency to demonstrate the ability to access filters through the pipeline
PassThrough filter is now created condiationally based on the parsed
JSON
adding more filtering options
  - statistical outlier removal (works)
  - voxel grid (does not work)
voxel grid cannot output indices, turn it off for now