Add Yarn option

[trentmwillis]

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Fixes https://github.com/tomdale/ember-cli-addon-tests/issues/76. Provides a nice speed boost.

[simonihmig]

LGTM, thanks for pushing this @trentmwillis!

Tests are failing however, yarn complains about some version mismatch. I have the suspicion that it behaves differently than npm, by checking the npm registry for our my-addon test addon, though the symlinked addon already exists. So it finds this interesting piece of software: https://www.npmjs.com/package/my-addon, whose only version is 0.0.1, as opposed to our symlinked 0.0.0! 😝

Maybe renaming my-addon to something more unique, like ember-cli-addon-tests-test-addon or whatever could be enough to fix the tests?

[simonihmig]

@trentmwillis Just wondering, are you able to continue work on this? If you don't have time, maybe someone other can take this over? Would love to see this land...

Apart from the comments above and the failing test, there are now some merge conflicts that need to be addressed... (@kellyselden has been on fire lately 😉 )

[trentmwillis]

Yeah, sorry, I likely won't get to this any time soon, so if someone else would like to pick it up, go for it!