Adding ability for XMPPStream to handle custom stanzas (non iq, message, presence), along with corresponding delegate methods.
Minor alteration to new API within XMPPModule. (changing method: didDeactivate -> willDeactivate)
Adding method to XMPPStream: getNumberOfBytesSent:numberOfBytesReceived: (simple atomic operation to fetch 2 related properties at the same time). Also updated XMPPBandwidthMonitor to use the new method.
Added a warning log statement if one attempts to set an invalid whitespace character.