Irc3

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- Add web plugin to allow to POST messages to channel via http

- Add slack plugin

- Avoid bug in userlist when a user parts before join (twitch)

- Drop py33, py34 support

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- Add `irc3.__main__` to allow `python -m irc3 config.ini`

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- Add `command(error_format=callable)` argument.

- Add ${} as a shorter alias for ${hash}.

- Bug fix in fifo plugin. We now remove the file first if it's not a pipe.

- Fix some irc3d issues with QUIT and KICK command

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- Added storage.getlist()/setlist()

- Improve autocommands

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- Command aliases support (121)

- Add quakenet plugin (99)

- Allow dash character in command

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- Added ``bot.async_cmds.topic()``

- Use shlex to parse command args by default