Added HOG features to cascade detection algorithm.

Added pedestrian detection trained model for HOG cascade detection algorithm.

modules/objdetect/include/opencv2/objdetect/objdetect.hpp

@@ -298,7 +298,7 @@ CV_EXPORTS void groupRectangles_meanshift(vector<Rect>& rectList, vector<double>
 class CV_EXPORTS FeatureEvaluator
 {
 public:    
-    enum { HAAR = 0, LBP = 1 };
+    enum { HAAR = 0, LBP = 1, HOG = 2 };
     virtual ~FeatureEvaluator();
 
     virtual bool read(const FileNode& node);