Add new interface to getShapeActorMap
Merge pull request #725 from Logrus/master

Add new interface to getShapeActorMap
Add cmake option to choose HTML file suffix for Sphinx
Update Sphinx layout.html file
Add Sphinx CSS stylesheets
PCLVisualizer: save and restore camera information

Press ctrl + s to save camera parameters and ctrl + r to restore the
saved camera parameters.

If a camera file is specified with "-cam" option or pcd file(s) is(are)
available in the command line, the camera parameters will be written to
the corresponding file and can be restored later from that file.
In this case, PCLVisualizer will restore camera parameters automatically
from the corresponding file when the pragram restarts with the same
command line input.
Merge pull request #729 from taketwo/add-sphinx-cmake-options

Add cmake option to choose HTML file suffix for Sphinx
Merge pull request #730 from taketwo/update-sphinx-templates

Update sphinx templates
Merge pull request #703 from xiangxw/pcl_viewer_remember_camera_position

PCLVisualizer: save and restore camera information
Replace gtest with sytem version

- Add new FindGtest.cmake to find installed versions.
- Add libgtest-dev for Travis
Merge pull request #731 from jspricke/gtest_removal

Replace gtest with sytem version (closes #717)
Corrected elapsed time console print in line 73

Corrected return value for watch.getTimeSeconds() from int to double. Also corrected message that said time was in milliseconds, when watch.getTimeSeconds() returns elapsed time in seconds.
Merge pull request #739 from georgebrindeiro/patch-1

Corrected elapsed time console print in line 73
Fix #740: Segmentation fault when "r" is pressed

Segmentation fault when "r" is pressed in PCLVisualizer.
The previous pull request #703 does not handle the "r" keyboard event
correctly and pass the event to vtkInteractorStyleRubberBandPick,
which enables rubber-band selection mode when 'r' is pressed.
Merge pull request #742 from xiangxw/fix_pclvisualizer_r_pressed

Fix #740 and #732: Segmentation fault when "r" is pressed
Better message printing for pcd_viewer

Camera file restore message will print after the file is loaded.
Merge pull request #744 from xiangxw/pcd_viewer_print_auto_restore_message

Better message printing for pcd_viewer
Use a faster n-point sampler (thanks to Troels Bo Jørgensen for this code)
Remove a bug in a useless extra rejection step that caused a continue in all main loop iterations but the first (thanks to Jeppe Pedersen and Kent Hansen for catching this)
Use a cache for already computed feature correspondences (thanks to Jeppe Pedersen and Kent Hansen for the code)