Don't show extra border or allow zooming out further than required

Author: bgilbert

examples/deepzoom/templates/index.html

@@ -133,6 +133,9 @@ <h1>Slide properties</h1>
             showNavigator: false,
             animationTime: 0.5,
             blendTime: 0.1,
+            constrainDuringPan: true,
+            minZoomLevel: 1,
+            visibilityRatio: 1,
             zoomPerScroll: 2,
         });
     }