Modified To Retro-Fit Support For Newer Text Rendering Optimizations

[Lewiscowles1986]

really it consists of 3 lines of CSS, we also included mixins for less and css if you feel they are a better fit as options for designers

[tagliala]

https://github.com/blog/1135-the-making-of-octicons

Browsers use subpixel rendering by default. This looks great for text, but left the icons looking a little heavy as a result of the extra pixels it adds.

This is why fontawesome is using -webkit-font-smoothing: antialiased; instead of the default

AFAIK optimizeLegibility only add some incompatibilities with phonegap: https://github.com/FortAwesome/Font-Awesome/wiki/Troubleshooting#phonegap--android-icons-in-heading-tags

I'm curious about the tiny shadow, I will take a look

[robmadole]

First off, thanks for spending the time to post this PR. It's sat in the Font Awesome GitHub repo for far too long and we should have responded or addressed the work that you put into this.

Over the past year we've been hard at work on Font Awesome 5. It's now released and this PR no longer applies. So we're going to close it (with an apology for being so tardy).

If you think the work from this still applies feel free to reply and we'll take a second look.

– FA team