[core] Add SASL auth capability

This starts IRCv3 compatibility, but the interfaces should be refined
somewhat.
Add trigger.raw and fix issue #310
Merge pull request #315 from bui/master

Add trigger.raw and fix issue #310
Merge pull request #316 from DePierre/pep8

Fix PEP8 for [core] issue #125
Merge branch 'master' into ircv3
[admin] Join channels on invite
[admin] Use Bot.join instead of writing a join command.
Merge pull request #318 from DePierre/pep8

[core] Revert mistake on config.py #316
[rss] Report malformed XML; skip updating feed with unchanged etag

- Throw a debug message if the feed parser detects non-well-formed XML.
- Don't update the feed in the database if the etag and modified time
have not changed.
Merge pull request #319 from saltire/rss

[rss] Report malformed XML; skip updating feed with unchanged etag
[docs] Touch up a few flaws in the documentation
[rss] Add a class for representing feed rows.

- rss._RssFeed eases accessing the row fields.
[rss] Add handling for 301 and 410 http responses.
Merge branch 'master' of https://github.com/embolalia/willie
Revert "Add trigger.raw and fix issue #310"

This reverts commit b408543071842bf04346fb7f569eaa4d1061cb13.
[coretasks] Attempt to rejoin registered-only channels
forgot to import time
Merge pull request #320 from bui/master

Revert b408543 and fix #310
[reddit] fix error when poster has been deleted

Fixes #323
Merge branch 'ircv3'