Deep Copy for JSONObject(Map) and JSONArray(Collection) Constructors

When a JSONObject is constructed from a Java Map or a JSONArray is created from a Java Collection, Jettison only creates a shallow copy, which results in hybrid hierarchies and undesirable use of Map.toString() rather than JSONObject.toString() for internal objects. This patch recursively performs a deep copy in the relevant constructors both for purity of internal representation of JSON structures and for more desirable behavior in encoding to strings.