SMACK-456 Added the causing exception

XMPPConnection.connectUsingConfiguraiton() does now add the causing
exception to the throwed exception.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/smack_3_3_2@13765 b35dd754-fafc-0310-a699-88a17e54d16e
SMACK-444 Allow 'null' for options in ServerTrustManager

Allow 'null' for TruststorePath and TruststorePassword in ServerTrustManager

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/smack_3_3_2@13766 b35dd754-fafc-0310-a699-88a17e54d16e
SMACK-452 Correctly parse stream error packets

Modified PacketParserUtils.parseStreamError() to take into account that
there may be an optional text element and an optional application
specific element.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/smack_3_3_2@13767 b35dd754-fafc-0310-a699-88a17e54d16e