Compatibility with font-awesome fixed-width?

[jfly]

See https://fortawesome.github.io/Font-Awesome/examples/#fixed-width. An example of things not looking so great:

Right now, applying the fa-fw class to our icons doesn't work because they have a display of inline, I had to add the following css to get things looking nice:

.cubing-icon.fa-fw {
  display: inline-block;
}

And voila!