- Remove `underscore.js` from `static/third` and fetch it from `npm`.
- Upgrade `underscore.js` to 1.8.3.
- Bump up the `PROVISION_VERSION` to 4.2.
Part of #1709
We now sort lists of users ids deterministically, and we also
sort list of emails deterministically and without regard to case.
This probably fixes the bug #2343, although I never got a great
repro on that.
Some node tests used to pass as long as prior tests ran,
but then they would fail if you ran them standalone. Now
we are more aggressive about cleaning up node's require
cache after each individual test runs.