FortAwesome/Font-Awesome — pull request #3268 by jakofranko (2014-04-17 18:52:41+00:00)
Title: Corner support for stacked icons

I built out a little CSS to support the fa-stack-corner-* class for stacked icons, like this:

You can specify an icon to be in the nw, ne, sw or se corner. The corner icons will size dynamically if placed next to a fa-stack-2x icon, or if given the class fa-inverse or if placed next to another icon with the classname fa-inverse.

I also added support for black and white text-shadows based on whether the corner icon or it's sibling is normal color or inversed.