Update Spine to latest version (v1.3.2).

This does parallel requests properly, so we don't have to wait around for
each section before the next one is requested.
Added framework for showing cases ready to test.

I just need to hook up the API part of this now, i.e. get those cases
ready to review from Kiln.
Hooked up the "Your cases passed review" section.

This shows cases Awaiting review, where all associated reviews have been
approved.