title: Insertion-Order Dictionary (like Java's LinkedHashMap) in Swift?
body: <p>Is there a standard swift class that is a Dictionary, but keeps keys in insertion-order like <a href="http://docs.oracle.com/javase/7/docs/api/java/util/LinkedHashMap.html" rel="noreferrer">Java's LinkedHashMap</a>? If not, how would one be implemented?</p>