Added XEP-199 aka. "XMPP Ping" support to smack. Fixes SMACK-388.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@13384 b35dd754-fafc-0310-a699-88a17e54d16e
Fix issue with Socks5ProxyTest: The read() method throws an Exception if the socket is closed. Catch this Exception and report the testcase as successful.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@13385 b35dd754-fafc-0310-a699-88a17e54d16e
test-case.xml: Whitespace fixes, changed serverhost to localhost to reflect the settings in source code. This also makes it easier for new Smack developers to run the tests.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@13386 b35dd754-fafc-0310-a699-88a17e54d16e