Modularization of the Fest Assertions library

The Fest Assertions library, a fluent Java API for writing assertions in your test or production code, is quite popular in my development team. Because of it's clean and fluent interface, it was no question to me when trying to use it in an Android project. But due to it's dependency on java.awt classes and due to Android's missing support for them, I currently cannot use it for writing tests in my Android codebase.