fixed pyrlk optical flow
fixed mog2
added plain branch to HoughCircle perf test
adds include to fix build
add include limits, for compilers that dont add it implicitly
Merge pull request #1 from ImAlsoGreg/master

add include limits, for compilers that dont add it implicitly
Merge pull request #1568 from ilya-lavrenov:ocl_pyrlk
Merge pull request #1572 from emchristiansen:includeLimits
Merge pull request #1569 from ilya-lavrenov:ocl_hough_circles