0.3.0

Added index iteration (by Anton Winogradov @verybigman):

@each $val, $i in foo, bar {
  .icon-$(val) {
    background: url("$(val)_$(i).png");
  }
}

.icon-foo {
  background: url("foo_0.png");
}

.icon-bar {
  background: url("bar_1.png");
}