Dependency lib

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Create an abstraction layer for Greensock's JS implementation - source available at:
https://github.com/sandro-pasquali/Greensock

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Example of how to combine Greensock & Three.js
http://www.kadrmasconcepts.com/blog/2012/05/29/greensock-three-js/

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on a second thought, maybe:
https://github.com/sole/tween.js

[tracend]

The ultimate resource:
http://www.robertpenner.com/easing/