SMACK-425 Introduced smack.parsing.ParsingExceptionCallback, a callback invoked when a exception is thrown while parsing a stanza. Smack is now able to either rethrow the exception ulitmatly causing a disconnect *or* log/ignore the exception and resume parsing after the faulty stanza.

Conflicts:
	source/org/jivesoftware/smack/SmackConfiguration.java

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@13685 b35dd754-fafc-0310-a699-88a17e54d16e
SMACK-431 Entity Capabilities are now enabled as default for new connections. Added an extensions documentation html page.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@13686 b35dd754-fafc-0310-a699-88a17e54d16e
SMACK-405 Removed redundant code in XMPPConnection.shutdown()

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@13687 b35dd754-fafc-0310-a699-88a17e54d16e