ctor to build MxArray from cv::Vec<T,cn> and cv::Matx<T,m,n>
ctor to build MxArray from cv::Vec<T,cn> and cv::Matx<T,m,n>

This creates numeric arrays of similar sizes of type "double".

Also we implicitly get construction from std::vector of such classes,
which creates a cell-array.

CVML/mexopencv,CVML/mexopencv,fengzhyuan/mexopencv,bearpaw/mexopencv,fengzhyuan/mexopencv,nanit/mexopencv,bearpaw/mexopencv,nanit/mexopencv