fix #822 Close menus when clicking off them

[ScottDowne]

No description provided.

[ScottDowne]

I had some issues with this, and the solution I came up with feels a little weird.

The polymer closeMenus function did not work well on a document event.

[simonwex]

@ScottDowne could you see if you're still proposing we merge this?

[ScottDowne]

Small merge conflict, but trivial. This can now be looked at/merged.

The part I found to be weird is I could not use this inside the close menu function because sometimes it is a callback for window.onclick, which would mean this is actually window. So instead of this I used var userState = document.querySelector("user-state");