Fixed setCameraPosition in PCLVisualizer.

After setting the new camera position the camera clipping planes
where not adjusted which resulted in a black render window.
The site which pointed me in the right direction was
http://www.vmateevitsi.com/2011/10/25/vtkcamera-problem-with-setposition/
Fix bugs in cone visualization
Added function to set playback speed for OpenNI2 grabber.
This only has an effect on file devices.
Fix bad orientation & origin propreties
Merge pull request #879 from VictorLamoine/ply_fix

[PLYReader] Fix bad orientation & origin propreties
Merge pull request #872 from nylocx/cameraPoseFix

Fixed setCameraPosition in PCLVisualizer.
Merge pull request #881 from taketwo/pr877

Fixes for Cone Visualisation
Merge pull request #882 from nylocx/oni2PlaybackControl

Added function to set playback speed for OpenNI2 grabber.