allow parts of the upload process to say 'no, not ok!'

git-svn-id: file:///home/shish/svn/shimmie2/trunk@234 7f39781d-f577-437e-ae19-be835c7a54ca

core/events/uploadingimage.event.php

@@ -7,9 +7,11 @@
  */
 class UploadingImageEvent extends Event {
 	var $image;
+	var $ok;
 
 	public function UploadingImageEvent($image) {
 		$this->image = $image;
+		$this->ok = false;
 	}
 }
 ?>

core/ext/image.ext.php

@@ -22,7 +22,7 @@ class ImageIO extends Extension {
 		}
 
 		if(is_a($event, 'UploadingImageEvent')) {
-			$this->add_image($event->image);
+			$event->ok = $this->add_image($event->image);
 		}
 
 		if(is_a($event, 'ImageDeletionEvent')) {