Feature addition: StaticGen Favicon package

[GeorgeWL]

I've just created one for Hugo StaticGen, it works near identically to the C# implementation, of using partials, but with different data structure and preference for variables to be set in a config file..

See devcows/hugo-universal-theme#77 for my implementation of it on a Hugo Site.

Should work similarly on Jekyll, not as sure on Hexo, Spike or any of the other various www.staticgen.com site builders.

Though they all work on very similar concepts (using a templating engine and pre-made or custom-made html files with template functions and placeholders that are filled by the engine) the structure and exact method differs between each.

This is however if one isn't using Node, which each works with very well anyway.