backport of pr 67

commit d9e7bc219a998482a14c0b64a60b739571659d08
Author: Georg Ehrke <developer@georgehrke.com>
Date:   Tue Jan 14 13:42:55 2014 +0100

    remove dompdf from docx as it is in 3rdpart's root as well

commit 130091af979be292ae42b2bcae8f96bfadc3be37
Author: Georg Ehrke <developer@georgehrke.com>
Date:   Wed Jan 15 17:29:19 2014 +0100

    fix reference in phpdocx's load_font.php

commit c65656d475e2fbe64f281b4edb7b9015b3b91e57
Author: Georg Ehrke <developer@georgehrke.com>
Date:   Wed Jan 15 17:31:16 2014 +0100

    remove demo files from phpdocx

commit 06a9577bb45fed32c4051efa50ef8893d590c40d
Author: Georg Ehrke <developer@georgehrke.com>
Date:   Sun Feb 2 12:25:23 2014 +0100

    add patches.txt
Backport of 62abb12..ed584c3 and 8910e51 from master

Fix XML processing in GetID3
Fix XML processing in PHPExcel
Fix XML processing in SabreDAV
Fix a security problem with SabreDAV
Fix XML processing in PHPDocx
Some missing PHPExcel patches
Mention external entity patches
Set back libxml_disable_entity_loader state after use
Merge pull request #78 from owncloud/stable6-libxmlentitystateresetafteruse

Set back libxml_disable_entity_loader state after use