- run(): don't block sync()s if one is already running; instead, stop
the task
- get_special(): safely recover from API query exceptions that don't
release the site's SQL lock
- get_notes(): detect protocol-independent links as references, and
ignore links to the current site (#24)
- get_special(): reduce 100-lookup limit to 50, since 100 is already
about three minutes of querying

Resolved conflicts in __init__.py and managers.py

* Much of the documentation doesn't match the code; code will be
updated in develop soon

* Support for starting commands using the bot's name
* Moved _wrap_check and _wrap_process to the CommandManager
* Removed extra sortkey in afc_statistics