Scratch that last pull requests - IP sending is now accessed through a separate route.

It seems the VPS admin page has slowed down dramatically since the addition of the available-ip viewing (though I'm not exactly sure why). Since it's not affecting the template in any way and is only for API purposes, that feature should be accessed through a different route anyway.

So now, `/vps/<vps>/admin/available-addresses.json` serves available addresses in JSON format, and the admin page is unaffected by this.

I apologize for the issues with speed in the admin page since the last PR was merged.