use resetState() instead of toggle() when tap the outside of app.
Added overridden sequence for ACTION_TOGGLE and ACTION_RESET's method.
They are replaced Activity#onToggleFlyingMode and
Activity#onResetFlyingMode respectively if target Activity has them.
renamed installToViewGroup to attachTo
use constant value for ACTION_TOGGLE
Added ACTION_TOGGLE_PIN
fixed pin's initial state.
added target fragment
added speed argument to toggle event.
test code: forceSetBlackBackground
prepare 1.2.0
hooked DecorView.setBackgroundDrawable for window background.
prepare 1.2.1
removed duplicated PACKAGE_NAME
use InitialPosition when received Actions.
update FlyingLayout