Support test reports, test coverage reports, API docs

[jasperblues]

I started something here: https://github.com/jasperblues/xcode-gradle

. . . but haven't had time to continue. Most importantly, there needs to be an easy way to produce test coverage reports that can be viewed either locally or by build server.

[adamwaite]

Hey, sorry I have only just seen this. Not sure how it escaped my attention. That'd be a really nice feature to have. I'm silly busy with client work at the moment but I'll leave this issue open and come back to it.