Updated cloud io functionality - removed dependency from VTK legacy
More proper OpneCv+Qt+Vtk issues handling (http://code.opencv.org/issues/3492)
cloud collection merges data only on rendering
fixed size_t/int conversion warnings
proper render call order (fixes some issues with VTK6.1)
default meshlab background
Fixed all OpenGL issues for Macos (via objective-C++ layer)
cloud collection finalize
casting Vec3b operator for viz::Color
Added WidgetMerger, Polyline - colors support for each point independently, simple widgets now compute color array instead of setting global color
fixed crash for windows if console widow is closed or CTRL_C/CTRL_BRAK keys in console are pressed.
source compatibility with master
iteractor work
Remove clReleaseDevice call (workaround for pure  virtual call on Windows)
iteractor work
Clarifying comments
fix variable name typo in calcBlurriness
added performance tests for cv::ocl::calcHist
Merge pull request #2457 from ilya-lavrenov:ocl_calc_hist
Merge pull request #2448 from akarsakov:ocl_cxt_termination