@Override
    public void initialize(XMPPServer server) {
        super.initialize(server);
        privateStorage = server.getPrivateStorage();
    }
Implements the TYPE_IQ jabber:iq:private protocol. Clients
use this protocol to store and retrieve arbitrary application
configuration information. Using the server for setting storage
allows client configurations to follow users where ever they go.
<p>
A 'get' query retrieves any stored data.
A 'set' query stores new data.
</p>
<p>
Currently an empty implementation to allow usage with normal
clients. Future implementation needed.
</p>
<h2>Assumptions</h2>
This handler assumes that the request is addressed to the server.
An appropriate TYPE_IQ tag matcher should be placed in front of this
one to route TYPE_IQ requests not addressed to the server to
another channel (probably for direct delivery to the recipient).
<h2>Warning</h2>
There should be a way of determining whether a session has
authorization to access this feature. I'm not sure it is a good
idea to do authorization in each handler. It would be nice if
the framework could assert authorization policies across channels.

@author Iain Shigeoka
xmppserver/src/main/java/org/jivesoftware/openfire/handler/IQPrivateHandler.java