Original XMPPHP is no longer maintained
Therefore I've done some optimizations and imported some commits from birkner and zorn-v forks.
None of the forks really looked ready to be adopted...
new Roster class handles roster and presence
XMPP now uses XPath handlers exclusively
git-svn-id: svn://netflint.net/xmpphp@63 ef36c318-a008-4979-b6e8-6b496270793b