"install DIRECTORY does not allow "COMPONENT" after PATTERN or REGEX"

Implemented Classifier and Wordspotter as two independent classes

Classifier implemented as an independednt class from the worspotter.
-Works both on CPU and GPU at expected top performance of 26ms per sample on a GTX 980Ti
-Simple demo for wordspoter added for cpp
-Interactiuve demo added for python

ensure that the double pass through CMakeLists.txt files do not generate double output

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