Fix multiple-dialog bug on make_tour page.

Fix:
	static/js/make_tour.js
		-if a .location-container image was clicked when a .dialog div was
		fadedIn, then a new .dialog div, corresponding to that image, would
		appear; .dialog divs would just stack on top of one another.
		-fixed by having hiding all .dialog divs before dialogAppear fadedIn a
		new one.