added face module

adds MSERsToERStats function and its documentation; adds webcam_demo sam...

World fix

make ERFilter compile with refactored ml

adds MSERsToERStats function and its documentation; adds webcam_demo sample code and modifies cmakelists to link with features2d module

updates documentation for the text module

Adds OCRTesseract class and sample demo

Adds The exhaustive search algorithm and updates the previous groupining algorithm; Add xml files with default classifier models;

added "text" module; added linemod to rgbd module, fixed compile errors in rgbd

Split highgui module to videoio and highgui

Tracking-Learning-Detection and MedianFlow

Fix include of imgcodecs