Updated Stylus mixin @font-face

fonts.styl

// Fonts mixin
font-file(file, ext, path)
  return path + file + ext

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

Added path for font files location, and style for font-style attribute.

How to use :

webfont('Open Sans', 'open-sans-webfont-italic', '../fonts/', true, 'normal', 'italic')