Adds two more examples of croped word recognition, and show how to set the beam size parameter for small lexicon.

fix small bug

Adds example on segmented word recognition. Shows the use of the OCRHMMDecoder with the NM and CNN default classifiers.

Better CNN model for character recognition. Trained with an augmented dataset by adding translation/scale variations. Updated the croped word recognition with new class numbering (compatible with previous NM classifier).

update to use the new createOCRHMMTransitionsTable() function, and fix program description in header comments

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