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