Investigate integration with react-tween-state

Right now, there is no animation model in React Canvas. It's up to each component to implement it's own solution. [Image](https://github.com/Flipboard/react-canvas/blob/master/lib/Image.js) is one example.

[react-tween-state](https://github.com/chenglou/react-tween-state) wraps this exact behavior as a mixin. This could be a nice way to standardize on how components animate state.