[Golist] easing equations, Go and Hydrotween

[Martin Wood-Mitrovski]

> *Or maybe I am wrong on this,* and I should create an org.goasap.easing 
> package since Go is attempting to be that common hub location for 
> standard animation elements. That logically makes sense; it just also 
> goes against my general bias that it's silly for every animation bundle 
> in the world to have another copy of the same functions. I'm torn but 
> tend to lean toward staying lean, instead of doing something that adds 
> to a what I see as a general clutter problem.

i would say dont include them, keep the dependencies of the core library to a 
minimum.

it only took me a few minutes to make my own 'EasingPack' which just gives me an 
easy way to flick through a set of easing equations. :)