Js.mocha

> This has been awhile coming! We needed to feel confident that the next release wouldn't break browser compatibility (e.g. the last few patch releases).
>
> Browser Tests in CI
>
> We now run unit tests against PhantomJS v1.x and an assortment of browsers on [SauceLabs](https://saucelabs.com), including:

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* [2080], [2078], [2072], [2073], [1200] - Revert changes to console colors in changeset [1192914](https://github.com/mochajs/mocha/commit/119291449cd03a11cdeda9e37cf718a69a012896) and subsequent related changes thereafter. Restores compatibility with IE8 & PhantomJS. See also [mantoni/mochify.js129](https://github.com/mantoni/mochify.js/issues/129) and [openlayers/ol34746](https://github.com/openlayers/ol3/pull/4746) ([boneskull])
* [2082] - Fix several test assertions ([mislav])

[1200]: https://github.com/mochajs/mocha/issues/1200
[2082]: https://github.com/mochajs/mocha/pull/2082

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* [2080] - Fix broken RequireJS compatibility ([boneskull])

[2080]: https://github.com/mochajs/mocha/issues/2080

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* [2078] - Fix broken IE8 ([boneskull])

[2078]: https://github.com/mochajs/mocha/issues/2078

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* [2053] - Fix web worker compatibility ([mislav])
* [2072] - Fix Windows color output ([thedark1337])
* [2073] - Fix colors in `progress` and `landing` reporters ([gyandeeps])

[2053]: https://github.com/mochajs/mocha/pull/2053
[2072]: https://github.com/mochajs/mocha/pull/2072
[2073]: https://github.com/mochajs/mocha/pull/2073
[gyandeeps]: https://github.com/gyandeeps
[thedark1337]: https://github.com/thedark1337

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* [2067] - Fix HTML/doc reporter regressions ([danielstjules])

[2067]: https://github.com/mochajs/mocha/pull/2067