Improve the comments and APIs provided by AB.js:
- Control becomes unsampled.
- A becomes control.
- B becomes treatment.
This code does not appear to be in use presently, so it's a great time
to change it.
Change-Id: I31d619f889ee45102a4aed774a6ec41f0d95ba7d
Updates QUnit test files from starting with "test_" to ending with
"test.js" in accordance with the Readers Wed coding conventions.
https://www.mediawiki.org/wiki/Reading/Web/Coding_conventions
Bug: T197884
Change-Id: I98877e3fc432b6edd0c53d834ef23b3ef8fb7d6a