Feature: add spring physics based animation

[sc0ttj]

"Spring-based" animations are animations that use spring-based physics to determine the duration of the animation, as well as the "bounciness", friction, speed, etc.

These kinds of animations are much more flexible and responsive than traditionally "tweened" animations - where you usually define a fixed duration, from/to value, a fixed easing function, etc.

There's loads of widely-used spring-based animation libraries for React, so Component should have one too - in the form of a lightweight, optional add-on like tweenState.

Each of the following candidates are decent because:

• a nice API
• less than 2kb minified and gzipped
• ideally can set all these spring settings: mass, friction, dampening, tolerance/precision
• at least some nice callbacks (easy to extend) like onStart, onUpdate, onFinish, etc

Here's a list:

• https://github.com/raphaelameaume/lemonade-spring

  • can animate objects & arrays, like tweenState! (..not just single properties like all the others)
  • spring settings: mass, friction, dampening, precision
  • about 1.8kb minified + gzipped

• https://github.com/ryanking1809/simple-spring

  • can only animate single properties
  • spring settings: tension, friction, mass, precision, framerate
  • lots of good callbacks
  • 1.6kb minified + gzipped

• https://github.com/mnmly/spring

  • can only animate single properties
  • spring settings: speed, tension, friction, velocity, tolerance
  • 1.1kb minified + gzipped

• https://github.com/asbjornh/tiny-spring

  • can only animate single properties
  • spring settings: stiffness, dampening, precision
  • 892 bytes minified + gzipped

• https://github.com/tommhuth/spring

  • can only animate single properties
  • spring settings: stiffness, damping, mass
  • few callbacks but simple
  • 1kb minified + gzipped

• https://github.com/skevy/wobble

  • can only animate single properties
  • spring settings: stiffness, damping, mass
  • lots of nice callbacks
  • 1.7kb minified + gzipped

• https://github.com/brunnolou/springs

  • can only animate single properties
  • spring settings: tension, friction
  • 723 bytes minified + gzipped

• https://github.com/tannerlinsley/springer

  • can only animate single properties
  • spring settings: wobble, tension
  • 1kb minified + gzipped

• https://github.com/rolyatmax/spring-animator

  • can only animate single properties
  • spring settings: stiffness, dampening
  • 2.8kb minified + gzipped

[sc0ttj]

Done. Added https://github.com/raphaelameaume/lemonade-spring as springTo addon..