Add support for setting the digest algorithm for derived signature

git-svn-id: https://svn.apache.org/repos/asf/webservices/wss4j/trunk@1565720 13f79535-47bb-0310-9956-ffa450edef68
Removing ConversationException

git-svn-id: https://svn.apache.org/repos/asf/webservices/wss4j/trunk@1565722 13f79535-47bb-0310-9956-ffa450edef68
Use the 2005/12 namespace by default for DerivedKeys/SecureConversation

git-svn-id: https://svn.apache.org/repos/asf/webservices/wss4j/trunk@1565723 13f79535-47bb-0310-9956-ffa450edef68