1.2.1

• Fix @import url() parsing (@leonardfischer, @Cerdic)
• Fix various directive parsing issues (@zoglo, @CatoTH, @Cerdic)
• Fix min(), max() (@Cerdic)
• Fix str-length(), str-index(), and str-insert() (@Cerdic)
• Fix is-superselector() and other select issues (@Cerdic)
• Fix call() argument name (@Cerdic)
• Fix random() (@Cerdic)
• Fix list-separator() on empty or one element list (@Cerdic)