Generates CSS for font-face

_font-face.styl

font-url(file)
  return "../fonts/" + file

webfont(family, file, hack-chrome-windows = false, weight = "normal")
  @font-face
    font-family family
    src url(font-url(file + ".eot"))
    src url(font-url(file + ".eot?#iefix")) format("embedded-opentype"), url(font-url(file + ".woff")) format("woff"), url(font-url(file + ".ttf")) format("truetype"), url(font-url(file + ".svg#" + family)) format("svg")
    font-weight weight
    font-style normal
  if hack-chrome-windows
    @media screen and (-webkit-min-device-pixel-ratio: 0)
      @font-face
        font-family family
        src url(font-url(file + ".svg#" + family)) format("svg")