Map function based on map name

[pascalduez]

var opts = {
  basePath: 'css/',
  maps: [ 'breakpoint.yml', 'font.yml' ]
};

.sowieso {
  font-family: font(text);
}
@media (min-width: breakpoint(medium)) {
  .sowieso {
    width: 100%;
  }
}