FortAwesome/Font-Awesome — pull request #2323 by mstduff (2013-11-02 18:03:09+00:00)
Title: Rewrote SCSS to utilize placeholders & make class output optional

Several updates made to SCSS, mainly for the ability to turn off class output to use placeholder selectors for more semantic HTML

Updates
------------
- added placeholders selectors for every class (http://sass-lang.com/documentation/file.SASS_REFERENCE.html#placeholder_selectors_)
- added variable to decide if classes should be outputted ($fa-show-classes)
- made icon declarations in a list for looping reasons
- made a alias list as well
- made _icons.scss utilize loops of icon and alias lists for management ease

Usage
---------
```scss
//using placeholder selector
.my-class {
@extend %fa;
@extend %fa-star;
}
// same as:

//using with text inline
.my-button {
@extend %fa-star;
&:before {
@extend %fa;
}
}
//new: this is a button
//old: this is a button
```