Rewrote moments of opencl version.
fixed a bug when double is not supported.
modified the copyright info.
vectorized ocl::threshold for single channel images
Resolved a bug and used ocl::multiply.
removed test for double since not all platforms support double, thus the sanity check cannot pass on all the platforms.
fixed a typo.
fixed ocl::warpPerspective
Merge pull request #1710 from melody-rain:2.4_moments_ocl
Merge pull request #1724 from ilya-lavrenov:ocl_thresh
Merge pull request #1726 from melody-rain:2.4_tvl1_ocl
Merge pull request #1727 from ilya-lavrenov:ocl_warpPerspective