Title: Add Chapter about Resteasy default behaviour change
Describe the issue:
1) by default xml documents with DTD are not allowed -> setting resteasy.document.secure.disableDTDs to false in web.xml is needed to allow it.
2) by default secure processing is set to true -> setting resteasy.document.secure.processing.feature to false in web.xml is needed to disable it.
Xerces 2.9.1.redhat-6 included in EAP 6.4.0 doesn't support Max atributtes limit.
This needs to be mentioned in release notes.
Suggestions for improvement: