fix so pan doesn't try to run while scaling fixing the jumping issue when portrait only.

Author: jetboh

Source/JTSImageViewController.m

@@ -547,6 +547,7 @@ - (void)setupImageModeGestureRecognizers {
     [self.view addGestureRecognizer:self.longPresserPhoto];
 
     self.panRecognizer = [[UIPanGestureRecognizer alloc] init];
+    self.panRecognizer.maximumNumberOfTouches = 1;
     [self.panRecognizer addTarget:self action:@selector(dismissingPanGestureRecognizerPanned:)];
     self.panRecognizer.delegate = self;
     [self.scrollView addGestureRecognizer:self.panRecognizer];