Currently, there are different default typedefs for Point_, Size_, and Rect_. This pull request at least makes sure that default typedefs exist for int, float and double variants of each of these types.

Added erGrouping function: Find groups of Extremal Regions that are organized as text blocks. Updated sample/cpp to use the complete text detection pipeline

Streamlined mexext detection, with removal of trailing whitespace/newlines handled by execute_process

first parameter of createERFilterNM1/createERFilterNM2 is now mandatory. changed the sample program to use the new prototypes

renamed getDefaultClassifierNM{1,2}() to loadClassifierNM{1,2}() and added "const std::string& filename" parameter (mandatory).

functions getDefaultClassifierNM1() and getDefaultClassifierNM2() allow to implicitly load the default classifiers when creating a ERFilter object