MO-323 bug fixes

o MXiBeanConverter – removed Mobilis namespace from IQ tag. The XMPP server will remove the namespace of the actual been, when the same namespace is present in the IQ tag.
o MXiMultUserChatDiscovery
	– bug fix on initializing object
	– added method call in MUC discovery process
o MXiMultiUserChatDiscovery – minor bug fix