Added Macro to disable Stereo and upgraded to OpenCV4.

Ref #1

src/trackingRoiItem.cpp

@@ -5,6 +5,8 @@
 #include "view.h"
 #include "trackingRoiItem.h"
 
+using namespace::cv;
+
 TrackingRoiItem::TrackingRoiItem(QWidget *wParent, QGraphicsItem *parent)
     : QGraphicsRectItem(parent)
 {

src/vector.cpp

+#ifndef STEREO_DISABLED
 #include "cxcore.h"
+#else
+#include "opencv.hpp"
+#endif
+
 #include <QPointF>
 #include <QPoint>