touchcancel binded event was not correctly unbind (#104)

Author: tanquetav

src/angular-sortable-view.js

@@ -456,7 +456,7 @@
 					html.addClass('sv-sorting-in-progress');
 					html.on('mousemove touchmove', onMousemove).on('mouseup touchend touchcancel', function mouseup(e){
 						html.off('mousemove touchmove', onMousemove);
-						html.off('mouseup touchend', mouseup);
+						html.off('mouseup touchend touchcancel', mouseup);
 						html.removeClass('sv-sorting-in-progress');
 						if(moveExecuted){
 							$controllers[0].$drop($scope.$index, opts);
@@ -622,4 +622,4 @@
 		};
 	}
 
-})(window, window.angular);
+})(window, window.angular);