VYSPER-330: pollNext() has been fixed and improved so highestContinuousRid is now always uptodate. no more need for handling request window state in BoshBackedSessionContext.writeBoshResponse
mina/vysper/trunk/server/extensions/xep0124-xep0206-bosh/src/main/java/org/apache/vysper/xmpp/extension/xep0124/BoshBackedSessionContext.java