IDE support

I created an [Android Studo plugin](https://github.com/evant/android-studio-unit-test-plugin) which requires a gradle plugin to provide a model for the ide to read. I don't expect you to merge this pull request as-is because it dependes on a local library that provides the interface between the plugin and the ide. This [library](https://github.com/evant/android-studio-unit-test-plugin/tree/master/android-unit-test-model) needs to be hosted seperatly on maven central so that the gradle plugin can be updated independently. I'm not sure if you want to pull this in and maintain it yourself, or have me do it.
But I don't think JUnit Run configuration knows about gradle at all. Anyway, That Task can actually be useful for me either way to build my tests.