#181: fix LazyList to correctly handle negative indices
#181: fix LazyList to correctly handle negative indices

ceylon/ceylon.language,unratito/ceylon.language,unratito/ceylon.language,lucaswerkmeister/ceylon.language,ceylon/ceylon.language,lucaswerkmeister/ceylon.language,jvasileff/ceylon.language,jvasileff/ceylon.language