Add initial skeleton client XML parsing to XMPP server.
Add initial skeleton client XML parsing to XMPP server.

Creates a new Expat parser when the client connects, registering the
correct callbacks, etc., and calls the parse function when new data
comes in.  Doesn't actually do anything with the data yet though.

BellerophonMobile/xmp3,BellerophonMobile/xmp3,BellerophonMobile/xmp3