move some resources from samples to here

[blairmacintyre]

There are a few resources libraries in samples and argon-aframe that are things people may want to "rely on", and that should be synchronized with argon.js

right now these include: ArgonSunMoon.js, CSS3DArgonHUD.js and CSS3DArgonRenderer.js, and are in the code/resources/lib directory in the samples repo. Should we just leave them there, or move them here, and have the URLs point here.

We should start being more careful to help people know what these are, and use the right versions. We should also avoid duplication. Right now these are in argon-aframe, too, for example.

[speigg]

I'm not entirely sure what a good solution is, but I'd rather keep this repository free from bindings to other libraries (such as three.js), as that seems like a path that could easily become painful if we start adding more bindings. Perhaps we should create a separate repo, i.e, argon-three, for this stuff.

[blairmacintyre]

Separate repo might be fine. We could start collecting other bits of useful code in files there, such as ways of dealing efficiently with things (like code to do things requested #52)