Support choosing test framework?

[cgcgbcbc]

For example the awesome avajs/ava ?

[silvenon]

I haven't had a chance to play with it yet, but it does look awesome. I'd love to have it, but in the form of a composed generator.

Ideally, there should be a generator-ava. More ideally, there should be a generator-test which composes generator-mocha, generator-jasmine, and generator-ava, so we can compose generator-test.

I'd be up for creating generator-ava, but I can't promise 😁