Adds PubSubEvent Element. Adds StreamFeaturesSerializer. Adds ParserTester, ElementParserTester, StanzaParserTester, PayloadParserTester, PayloadsSerializer and EnumParser. Updates Error Payload, JingleFIleTransferHash Elements/ Updates StreamFeaturesParser, ParserElement. Updates Delay Serializer, Error Serializer. Updates AuthChallenge and AuthRequest Element. License: This patch is BSD-licensed, see Documentation/Licenses/BSD-simplified.txt for details. Test-Information: Test are added for: AuthChallenge Serializer, AuthRequest Serializer, AuthResponse Serializer, AuthSuccess Serializer. GenericPayloadTreeParserTest. IQ Parser. Message Parser. Presence Parser. StanzaAck Parser. Stanza Parser. StreamFeatures Parser and Serializer. StreamManagementEnabled Parser. Private Storage Parser and Serializer. RawXMLPayload Parser. Storage Parser and Serializer. Error Serializer. Jingle Serializer. PubSubItem Serializer and PubSubItems Serializer. Serializing Parser. All tests passes. Change-Id: I79e00dc5b5c4f85e659bf88b1547dd7c17825805