added variable to define OpenCV version
Adding OpenCL support
Corrected vglClUpload bug
Corrected VGL_BLANK_CONTEXT bug.
Corrected Makefile.
Various small corrections. Added comments to and renamed CL kernels.
Improving CL support. Adding directive to specify arrays as parameters
Correcting bugs in cl2cpp.pl. Improved benchmarking to milisseconds precision.
Merge remote-tracking branch 'upstream/master'
Sync with upstream
Revert "Sync with upstream"

This reverts commit 849d55bf60da5f73f1dc86186575f1cbc516e6f3.