Clear AJAX queue if new request is made.

[rogeredthat]

Currently, if you alternnatively click on two menu items, you end up seeing the pages lternatively appear and disappear long after you're done clicking. To fix this:

1. Stop the exisiting AJAX query if the requeted URL is different.
2. Ensure it doesn't break the existing lack of duplicate requests on same URL.

We also have to ensure that the settimeout is properly cleared on success/failure.

[ryan-barrett]

Hi, can I work on this?

[aero31aero]

Hey! Thanks for your interest in this, and sure!

The relevant function is: https://github.com/crux-bphc/fest-manager/blob/pearl/public/static/scripts/index.js#L41 which is called as manager.route("/somewhere"); in the codebase.