master-like performance tests
Added NEON optimizations for LK optical flow (Intrinsics).
tests
ability to merge logs with intersections only
Merge pull request #2432 from ilya-lavrenov:summary_py
typos
Merge pull request #2439 from ilya-lavrenov:typo
Merge pull request #2407 from codyrigney92:LKOptFlow_NEON
Merge pull request #2429 from ilya-lavrenov:master_compatible_tests
Fix for #3554

v4l2_scan_controls_enumerate_menu is unused and causes ioctl error on
RaspberryPi and possibly other Video4Linux variants. See
http://www.raspberrypi.org/forum/viewtopic.php?f=43&t=65026 for more
detail.
Remove clReleaseDevice call (workaround for pure  virtual call on Windows)
tuned some tests
Clarifying comments
Merge pull request #2443 from waveform80:issue-3554
Merge pull request #2445 from ilya-lavrenov:ocl_perf
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
Merge remote-tracking branch 'origin/2.4' into merge-2.4

Conflicts:
	modules/calib3d/perf/perf_pnp.cpp
	modules/contrib/src/imagelogpolprojection.cpp
	modules/contrib/src/templatebuffer.hpp
	modules/core/perf/opencl/perf_gemm.cpp
	modules/cudafeatures2d/doc/feature_detection_and_description.rst
	modules/cudafeatures2d/perf/perf_features2d.cpp
	modules/cudafeatures2d/src/fast.cpp
	modules/cudafeatures2d/test/test_features2d.cpp
	modules/features2d/doc/feature_detection_and_description.rst
	modules/features2d/include/opencv2/features2d/features2d.hpp
	modules/features2d/perf/opencl/perf_brute_force_matcher.cpp
	modules/gpu/include/opencv2/gpu/gpu.hpp
	modules/gpu/perf/perf_imgproc.cpp
	modules/gpu/perf4au/main.cpp
	modules/imgproc/perf/opencl/perf_blend.cpp
	modules/imgproc/perf/opencl/perf_color.cpp
	modules/imgproc/perf/opencl/perf_moments.cpp
	modules/imgproc/perf/opencl/perf_pyramid.cpp
	modules/objdetect/perf/opencl/perf_hogdetect.cpp
	modules/ocl/perf/perf_arithm.cpp
	modules/ocl/perf/perf_bgfg.cpp
	modules/ocl/perf/perf_blend.cpp
	modules/ocl/perf/perf_brute_force_matcher.cpp
	modules/ocl/perf/perf_canny.cpp
	modules/ocl/perf/perf_filters.cpp
	modules/ocl/perf/perf_gftt.cpp
	modules/ocl/perf/perf_haar.cpp
	modules/ocl/perf/perf_imgproc.cpp
	modules/ocl/perf/perf_imgwarp.cpp
	modules/ocl/perf/perf_match_template.cpp
	modules/ocl/perf/perf_matrix_operation.cpp
	modules/ocl/perf/perf_ml.cpp
	modules/ocl/perf/perf_moments.cpp
	modules/ocl/perf/perf_opticalflow.cpp
	modules/ocl/perf/perf_precomp.hpp
	modules/ocl/src/cl_context.cpp
	modules/ocl/src/opencl/haarobjectdetect.cl
	modules/video/src/lkpyramid.cpp
	modules/video/src/precomp.hpp
	samples/gpu/morphology.cpp
Merge pull request #2465 from SpecLad:merge-2.4