This makes it so gradle provides all dependencies, rather than a mix of
classes that are copied in versus imported via gradle. This library is
already used by the tests, so its not really a new dependency, and proguard
should remove all the unused stuff.
This makes it a lot easier to setup all the testing stuff. Mostly,
I'm tired of fighting Android Studio's fragility, so I want to remove
as much non-standardness as possible in the hopes of improving that
situation.
closes#534https://gitlab.com/fdroid/fdroidclient/issues/534
