Allow argument parsers to return lists for multi-valued arguments (ceylon/ceylon-compiler#881)
Allow argument parsers to return lists for multi-valued arguments (ceylon/ceylon-compiler#881)

ceylon/ceylon-common,ceylon/ceylon-common,ceylon/ceylon-common,jvasileff/ceylon-common,jvasileff/ceylon-common,jvasileff/ceylon-common