Sopel-rtfm

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Added:
* `.docs` command alias, for when `.rtfm` feels harsh (2)

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Added:
* Proper help output for `.rtfm` command (1)

Changed:
* Prioritize "bigger" object types when sorting results
* Simplify retrieving output URL

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Added:
* Caching behavior: The configured Sphinx inventory is fetched at startup, and
re-fetched automatically every 24 hours
* Bot admins can force an update with the new `.rtfmupdate` command

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Changed:
* Empty/missing query now outputs the docs' base URL instead of an error

Fixed:
* `rtfm_base` was left in `bot.memory` after `shutdown()`

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Initial release.