Click on mobile triggers the move functions to be called multiple times

[Flyrell]

On mobile, click or mousedown events also triggers touchstart which triggers the touchmove event handler to be bind multiple times. Then, when navigating, the moveDown or moveUp functions will be called multiple times (# of clicks + 1), that means you'll end up at the different page.

The fix would be to bind the touchmove event only once or to unbind it before binding. Might be also useful to add some updates, etc. I'd like to contribute, but I have no idea when I'll have a free day to look at the issue.