- 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
Also, de-emphasize the process for creating new test modules,
as this is an advanced task that we can further document later
and generally handle as part of code review.