Irc

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* Removed deprecated arguments to ServerConnection.connect. See notes on the

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* Filter out disconnected sockets when processing input.

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* Created two new exceptions in `irc.client`: `MessageTooLong` and
`InvalidCharacters`.
* Use explicit exceptions instead of ValueError when sending data.

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* SingleServerIRCBot now accepts keyword arguments which are passed through
to the `ServerConnection.connect` method. One can use this to use SSL for
connections::

factory = irc.connection.Factory(wrapper=ssl.wrap_socket)
bot = irc.bot.SingleServerIRCBot(..., connect_factory = factory)

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* Issue 6: Fix AttributeError when legacy parameters are passed to
`ServerConnection.connect`.
* Issue 7: Fix TypeError on `iter(LineBuffer)`.

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