Replaced all references to persistence manager to use the SharedContext SPI instead. Eventually its likely this class will be removed.

git-svn-id: https://svn.apache.org/repos/asf/wookie/trunk@1566056 13f79535-47bb-0310-9956-ffa450edef68
Use SPIs instead of persistence manager for Ajax API.

git-svn-id: https://svn.apache.org/repos/asf/wookie/trunk@1566057 13f79535-47bb-0310-9956-ffa450edef68