Support @import
The script should support @import stanzas that get font-related CSS from fonts.googleapis.com/css.
Example:
@import url('https://fonts.googleapis.com/css?family=Aleo|Oswald|Raleway|Roboto');
font-family: 'Roboto', sans-serif;
font-family: 'Oswald', sans-serif;
font-family: 'Raleway', sans-serif;
font-family: 'Aleo', serif;