Change the order of Route evaluation in v3

[jeffposnick]

Library Affected:
workbox-routing

In v1/v2 we gave precedence to the most-recently-registered Route when choosing the matching Route in our Router.

This was a somewhat arbitrary choice (I can't remember the original decision) and has periodically caused confusion, and in practice, has led to issues like #839

I'm cool with switching to making the earliest-registered Route take precedence in v3, which would match how things work in, e.g., Express.

[gauntface]

+1. No question in my mind.

Is there anywhere we should track breaking changes like this? We could just do a markdown doc on webfundamentals workbox-v3 branch. We can all commit, it's public and will most likely be a good place to host the changelog. Thoughts?

[jeffposnick]

This was done in #854.