Fix Stylus parsing error with multi-line font-family src values
Restore the FontAwesome font-face declaration

Now that importing `path.styl` no longer results in a parsing error, it can be
safely included in the initialization process once again.
Fix literal variable-name inclusion in rotation mixins

Stylus was getting confused by the attempted interpolation of the rotation
value in the `filter` property and rendering the the `filter` value with
a literal `{$rotation}` string in it.  Using string addition resolves the
value of the variable and generates a valid `filter` value.
Merge branch 'mixin-interpolation'

* mixin-interpolation:
  Fix literal variable-name inclusion in rotation mixins
Merge branch 'font-face'

* font-face:
  Restore the FontAwesome font-face declaration
  Fix Stylus parsing error with multi-line font-family src values