Added the multi tracker class

fixed warnings in the tracking module

Fix for Itseez/opencv_contrib/issues/278 - core dump in the case of no match(...) results.

Adds a first implementation of the OCRBeamSearchDecoder class

TLD fixes & optimizations

Added KCF Tracker Framework

added PASCAL VOC dataset

Adds a first implementation of the OCRBeamSearchDecoder class using the Single Layer CNN character classifier described in Coates, Adam, et al. paper: Text detection and character recognition in scene images with unsupervised feature learning, ICDAR 2011

Added confidence support to disparity filtering

DisparityWLSFilter demonstrated the best results, so I removed all the other
filters. Quality was significantly improved by adding confidence support
to the filter (left-right consistency + penalty for areas near depth discontinuities).
Filter was optimized using parallel_for_ and HAL intrinsics. Demo application was
rewritten for better compliance with OpenCV standards. Added accuracy and
performance tests. Documentation was added, as well as references to the
original papers.