Pmxbot

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* 52: Updated usage in MongoDBKarma to follow
recommendation in `SERVER-27707
<https://jira.mongodb.org/browse/SERVER-27707>`_.

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* Fix usage in slacker client.

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* Moved select dependencies into extras, which you must
declare in your deployment::

- irc: for IRC bot
- slack: for Slack bot
- mongodb: for MongoDB persistence
- viewer: for web viewer

For example, to deploy Slack bot with MongoDB::

pip install pmxbot[slack,mongodb]

* 58: Use ``slacker`` to open IMs when they're not already
open.

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* 57

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* 57: Try another technique for resolving the DM channel.

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* Monkey-patch the slack client module to implement some
basic user message functionality.