Generate Kotlin Multiple Rounds Save

Sample created for the article "Pushing the limits of Kotlin annotation processing".

This sample Android project demonstrates:

1. Generating Kotlin code though an annotation processor.
2. Feeding that generated code into a second round of annotation processing by putting it into a Gradle module and consuming it into another one.
3. Testing that a second round of processing has happened. In this case Dagger 2 (used as an example) is consuming the previously generated code to generate additional classes.