Added fixes to the wsdl file in order to work with OpenNMS.

Squashed commit of the following:

commit e1783cc35410a4ca0b07d9c3bf79119cd9e5e7b5
Author: Carlos Rodriguez <carlos.rodriguez@otrs.com>
Date:   Mon Oct 21 13:16:50 2013 -0500

    Removed CreatedBy tag from TicketGet response.

commit fccb4b0fd6efadeb67b94f2f949810db9537157e
Merge: 110ac43 cd3ec6d
Author: Carlos Rodriguez <carlos.rodriguez@otrs.com>
Date:   Mon Oct 21 07:39:47 2013 -0500

    Merge branch 'master' of github.com:blackpoplar/otrs into blackpoplar-master

commit cd3ec6d98085520f8291a50b40a99ad4504fb20b
Author: Jonathan Sartin <jonathan@opennms.org>
Date:   Wed Oct 2 22:47:21 2013 +0100

    Several Fixes to wsdl

commit 4e2953d95794372e5d954a8b0ce29921a592fe35
Merge: 92c7957 7873fe7
Author: Jonathan Sartin <jonathan@opennms.org>
Date:   Wed Oct 2 16:23:47 2013 +0100

    Merge remote-tracking branch 'upstream/master'

commit 92c7957841e94e1aa94e01192f07e50a07db021a
Author: Jonathan Sartin <jonathan@opennms.org>
Date:   Wed Oct 2 16:18:28 2013 +0100

    Revert "import wsdl changes for functioning OpenNMS integration"

    This reverts commit ff936950e96349ed8b1747d91766a3f9a3b914cf.

commit ff936950e96349ed8b1747d91766a3f9a3b914cf
Author: Jonathan Sartin <jonathan@opennms.org>
Date:   Fri Aug 2 18:04:45 2013 +0100

    import wsdl changes for functioning OpenNMS integration