Renames chatexchange.wrapper.SEChatWrapper -> chatexchange.client.Client

ref #59
Update version number to indicate that we are at least working towards a non-zero release version number.

With #66 since it seems useful to tie this version jump to the rename.
Adds incomplete User and Room, and a failing test setting some goals.

        me = client.get_me()
        sandbox = client.get_room(11540)

        with sandbox.messages() as messages:
            sandbox.send_message("hello worl")

            for message in messages:
                if message.owner is me:
                    assert my_message.content == "hello worl"

ref #65, ref #52, ref #43