Typography libertine

This depends on #22 which should be merged first.

The Libertine family of fonts is not only a free and well designed font choice, it has one of the more complete sets of Unicode glyphs around making it great for consistent typesetting across languages.  

* https://en.wikipedia.org/wiki/Linux_Libertine
* http://www.linuxlibertine.org/index.php?id=1&L=1

I saw you've previously implemented web-fonts using a combination of formats. I know this was necessary a few years back, but I'm not sure all of those are necessary now. WOFF seems to be pretty broadly supported. TTF, SVF, OTF and other formats are available for this font (and you can even generate EOT using FontSquirrel) but before I add all those to the repo I thought it would be better to review what the target browser market is right now. It looks like there are a few things in the code already than limit accessibility in older browsers. How far back do you want to target? I'm happy update this with whatever set of resources deemed necessary. This was just a place to start from.

Also, tho over-ride for HEB/GRK is kind of annoying when some of the other fonts actually have the necessary glyph support.

Might I suggest that whole bit gets re-implemented with a default font preference of a mixed set, but that if a specific font is selected, it is applied across the board?