1.6.1 - then() chaining for staggered animations with multiple targets

• then() chaining now works as expected when targeting multiple views
• It also works with staggered animations
• Added some more documentation and cleaned up examples a bit

1.6.0 - syntactic sugar and bugfixes

• targets(List objects) method to apply a set of animations to a list of objects.
• targets(List objects, long stagger) method to apply a set of animations to a list of objects, with a delay between each target.
• cancelAnimations() method can now take a list of objects.
• Breaking: subclasses of BaseAdditiveAnimator must now implement getCurrentPropertyValue() - look at the documentation of the method for implementation details.
• added SpringInterpolator class with two sets of default spring parameters (bouncy and soft).
• improved demos

Animated objects no longer need to be Views!

This release comes with the ability to animate any custom object.
The new demo fragment shows how to animate custom drawn objects on a canvas.

This came at the cost of a breaking change:
Subclasses of AdditiveAnimator will need to subclass SubclassableAdditiveViewAnimator as of v1.5.0.

Also, AdditiveAnimator doesn't use generics anymore, so this greatly improves interoperability with Kotlin!

1.3.1

Critical bugfix for animating custom fields without Property backing (when overwriting applyCustomProperties()) in a subclass.