Added implementation and tests for XEP-0085 - Chat State Notifications.

Chat states may be set using:

msg['chat_state'].active()
msg['chat_state'].composing()
msg['chat_state'].gone()
msg['chat_state'].inactive()
msg['chat_state'].paused()

Checking a chat state can be done with either:

msg['chat_state'].getState()
msg['chat_state'].name

When a message with a chat state is receieved, the following events
may occur:

chatstate_active
chatstate_composing
chatstate_gone
chatstate_inactive
chatstate_paused

where the event data is the message stanza. Note that currently these
events are also triggered for messages sent by SleekXMPP, not just those
received.

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