Pmxbot

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* Added MongoDBFullTextLogger, leveraging MongoDB Full Text Search on MongoDB
2.4 or later (if enabled).

1106
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* Removed !googlecalc, which depended on iGoogle, now defunct.
* Restored !urbandict using the API instead of HTML scraping.

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* Include channel in hyperlink for logs for logged channels.

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* Added support for logging leave events as well as join events.
* Added a new ``on_leave`` decorator, suitable for implementing custom
handlers for leave events.
* ``pmxbot`` command now optionally accepts multiple config files.

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* Added support for keepalives. To enable, set the 'TCP keepalive' config
value to a non-zero number of seconds or a period string like '3 minutes'.
If configured correctly, pmxbot will report during startup the interval
that it detected, and every interval, it will send a 'ping' message to the
server.
* Issue 27: Fix display of aliases in web help.
* Added a version command to get the pmxbot version or version of other
package in the environment.

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* Allow keyword arguments to regexp decorator.

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* Added `pmxbot.core.FinalRegistry` for registering callback functions to be
called when the bot exits.