added some Eigen::Map functions for the pcl::ReferenceFrame type
qhull doesn't create output to the stdout
Update pcd_grabber.h

Only include io/openni_camera includes if HAVE_OPENNI is defined.
fix simulation build, missing glut library
Merge pull request #126 from kartikmohta/patch-1

io/pcd_grabber.h: Only include openni includes if HAVE_OPENNI is defined
A new prerejective pose estimation and alignment routine (#940)

A new prerejective pose estimation and alignment routine (#940)

- and the compilation unit
A new normal refinement routine (#996)

A new normal refinement routine (#996)

- and the unit test
propertz changed to property
Check for null pointer before accessing interactor_ member

The visualizer could have been constructed with
create_interactor=false so the _interactor member is null.
fixed uncorrect printout in png2pcd tool
Fixed typo, changing 'teh' to 'the'
Changed order of step-by-step explanation so it follows source code

Put RadiusOutlierRemoval before ConditionalRemoval so "the explanation" would follow the order of the source code. Corrected minor typos (it's->its, CondtionalRemoval->ConditionalRemoval), corrected "literalincludes" so the source included comprises complete code blocks.
Minor english correction

have->had
Merge pull request #136 from georgebrindeiro/patch-4

Minor english correction
Merge pull request #133 from georgebrindeiro/patch-1

Fixed typo, changing 'teh' to 'the'
Merge pull request #132 from fedassa/master

Fixed incorrect printout in png2pcd tool
Merge pull request #114 from tcavallari/rf-imp

added some Eigen::Map functions for the pcl::ReferenceFrame type
Merge pull request #131 from patmarion/fix-visualizer-null-ptr-dereference

Check for null pointer before accessing interactor_ member
Revert "* thorough unit test for normal estimation"

This reverts commit 4bd780e16b063faf4a73dd2c5958ac356da3abac.
Simplify .travis.yml

- Remove clang for now (doesn't work)
- Simplify script to stay below the time limit