ScreenNavigator: may optionally pass a transition function to showScreen() and clearScreen(), pass transition to clearScreenInternal() instead of boolean
ScreenNavigator: now dispatches transition in and out events directly on screens (closes #992)
FeathersControl: the styleProvider property may now be changed after the component initializes. updated docs to explain that the old properties will not be reset in any way.
some docs clarifications
Button: added scaleWhenDown property, similar to the Starling button (references #995)
Button: added scaleWhenHovering property, similar to the scaleWhenDown property (closes #995)