Irc3

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- WARNING: we do no longer support python2. python3.3+ is required.

- WARNING: realname is now username and userinfo is now realname in config

- Introduce some plugins: fifo, shell_commands, pager

- Add ``flood_burst`` and ``flood_rate`` options. Queue outgoing messages in a
single queue handle by ``send_line('...', nowait=False)``.

- ``bot.async`` is now aliased to ``bot.async_cmds`` to be able to use ``await``

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- use re.escape to escape command char

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- logger plugin now take care of unicode

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- fixed 76: split large messages using textwrap.wrap(). This will avoid RevQ
exceeded.

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- fix DCC stuff for python3.5

- added DCC examples at https://github.com/gawel/irc3/tree/master/examples

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- ${hash} is now replaced by in config files. This allow to set real channel
names.