before merge with PR2 instructions
Merge branch 'master' of https://github.com/sunwaylive/Point-Cloud-Processing-For-Siggraph-2014

Conflicts:
	Point Cloud/Algorithm/NBV.cpp
	Point Cloud/UI/camera_para.ui
fix bug in view prune
Merge branch 'master' of https://github.com/sunwaylive/Point-Cloud-Processing-For-Siggraph-2014
merge-1
Merge branch 'master' of https://github.com/sunwaylive/Point-Cloud-Processing-For-Siggraph-2014
change the parameters for running Visibility NBV