Messy temporary link tracking

There are a couple of instances where I want to know where in our pages people are clicking when they navigate to the next page, and the path of the page they navigate to is not enough. This adds query string tracking to help with this.

Admittedly this is a bit messy from a UX perspective but it's 1/10th as hard for us to implement as invisible events and it will only be live for a week, at which point I can clear it up.

@jamesshedden