_fonts.scss, is it functional?

[Mazyod]

There are two issues I would like to point out, honestly:

1. There is an error that continuously shows up:

   WARNING on line 61 of /Users/$USER/Documents/octopress/sass/_syntax.scss: "html .gist .gist-file .gist-meta" failed to @extend ".sans".
   The selector ".sans" was not found.
   This will be an error in future releases of Sass.
   Use "@extend .sans !optional" if the extend should be able to fail.

2. Does the _fonts.scss actually works? I try to change stuff there, but Octopress isn't detecting any changes at all.

Best,
Maz