implemented OpenCL version of cv::accumulate****
added cv::calcHist to T-API (only for CV_8UC1 with 256 bins)
added performance test
added performance test
added conditional compilation
Merge pull request #2226 from ilya-lavrenov:tapi_calcHist
Merge pull request #2220 from ilya-lavrenov:tapi_accumulate
Merge branch 'add_prob_result_bayes_classifier', remote-tracking branch 'upstream/master' into add_prob_result_bayes_classifier
Fixed alignment