Consider mentioning the Intern testing framework

[jason0x43]

Intern has been using Istanbul internally for instrumentation for several years, and the soon-to-be-released Intern 4 also works with nyc.

Instrumentation is on by default in both the current and dev release. Both versions allow instrumenter options to be set with an instrumenterOptions property. In the current 3.x version the files that are covered are controlled by an excludeInstrumentation property, and in version 4 it's managed with the coverage property.

[bcoe]

@jason0x43 would be very happy to mention it, perhaps we could add a tutorial for running tests with coverage for intern?

[jason0x43]

Sure, I can do a PR along the lines of some of the other tutorials.

[jason0x43]

See #85