refactor(API): Allow application arguments for registerPrimaryStage() and setupApplication().
refactor(Legacy): Remove AppRobotTestBase and use FxLifetime.
refactor(Legacy): Remove framework.{app,junit} and move framework.launch.
fix(Legacy): Implement old behavior.
refactor(Toolkit): Rename FxLifecycle to FxToolkit.
refactor(API): Move integration tests.
Merge pull request #170 from hastebrot/refactor-fxtoolkit

refactor(Toolkit): Prepare API for beta phase.