Merge remote-tracking branch 'origin/TLD/VOT2015_Datasets_Support' into…

Merge remote-tracking branch 'origin/TLD/VOT2015_Datasets_Support' into TLD/VOT2015_Datasets_Support

Conflicts:
	modules/datasets/src/track_vot.cpp
	modules/tracking/include/opencv2/tracking/tracker.hpp

modules/tracking/include/opencv2/tracking/tracker.hpp

@@ -1256,7 +1256,7 @@ class CV_EXPORTS_W TrackerKCF : public Tracker
 
 @sa Tracker, MultiTrackerTLD
 */
-class CV_EXPORTS_W MultiTracker
+class CV_EXPORTS_W MultiTracker_Alt
 {
 public:
 	/** @brief Constructor for Multitracker