Provide minified javascript files in the build process

[frvge]

I don't see a big impact of this, but it's a good practice to provide minified JS files.

[XhmikosR]

https://github.com/CSSLint/csslint/tree/uglifyjs

Not sure which one we should minify. I mean, node doesn't make a lot of sense. One thing we need to get sorted is to append min before the js extension.