disable XML external entities in parsing inputted ATOM / GData document (OPSA-2013-003) (refs #3384)
changed not to use error control operator inside the opAtomPubDocument::loadXml() and some regulations in definition of the method (OPSA-2013-003) (refs #3384)
version 0.5.1.1
Merge remote-tracking branch 'security/release-0.5.1.1'