Bring back the Stats command

mwheeler turned off the automatic nickname aliases so his stats page is actually
accurate now.
Merge pull request #74 from Heufneutje/stats

Bring back the Stats command
Class naming changed
[Stats] add a link to the config
[Stats] shorten the config link
[Responses] make toggling case-insensitive
[Responses] oops
Create Notice command
[IRCResponse] unicode-ize the target
[ModuleHandler] encode target to utf-8 before send
[Chain] add $sender and $channel from Alias
[Boop] deboop
[Sed] per channel message stores
Delete Stats, it can be an alias instead
Delete Torrent, it can also be an alias
[Sed] oops
[Urban] the word is now a link, apparently?
[Urban] unsure why the link removal, but whatever
[Urban] thumb counts are in a different class now
[Urban] update to use the actual API