make YaBish a markov bot
rm unnecessary ||=
respond to the bot's nick as well
make patterns case-insensitive
rm debugging prints
rename Markov::{Bucket,Histogram}

"Bucket" was a pretty bad name :\
handle quotes better

ignore double quotes entirely, and only match single quotes inside words
eliminate partial inits
search the links if the seed is too short
rm a useless check
ignore the ya_bish db
use a localbot.rb
wip
a bunch of improvements to the markov bot

big ugly commit.  Append-based db updating, rate limiting, random
replies, random seed generation, etc.
oops forgot to add lib/util.rb
rename :last_minute to :last_interval

because the interval is no longer necessarily a minute
rm some debugging statements
Merge pull request #32 from jayferd/feature.markov

Turn YaBish into a markov bot