re run the failing tests first

[timothypratley]

Hi Jake,

Here's the code we mob programmed at the onsite, I don't believe the selectors are working though yet :(

[jakemcc]

I think the leiningen style selectors were working it was just hard to tell. For me this was partially because of the overridden :default selector.

The important changes to finishing this were:

• Change to track multiple failed tests at once.
• Change to track stringified failing test vars.

Now just need to clean up some of the mess I made in the process.

[jakemcc]

Released version 0.5.0 with this work in it.