Pmxbot

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* Extracted `RSSFeeds.format_entry`.

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* Added `pmxbot.core.SwitchChannel`. Handlers can yield this sentinel,
constructed with the name of a new channel, to cause subsequest messages
to be sent on the indicated channel.
* Removed db_uri from LoggingCommandBot (attribute and constructor).
Clients that invoke the constructor or expect the attribute to be present
will need to be updated to use the value from the config instead.

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* Refactored FeedHistory, allowing for other classes to re-use the history
concept in other RSS handlers.
* Exposed the bot instance as `pmxbot.core._bot` (experimental).

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* New regexp decorator. Similar to contains, except allows regular
expressions instead of simple string matching. See the README for an example
of usage. Thanks to `Craig Wright <https://bitbucket.org/crw>`_ for the
contribution.

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* pmxbot will assume local host name is appropriate for logs URL if no logs
URL is specified in the config.

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* One may now specify the database name in the URI.
* pmxbot will log the config when starting up.

1104
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* Updated to work with irc 5.0