Attempt to remind a user when they join the channel, not just when they speak.
Add a config option, defaulted to off, so the behaviour won't change unless deliberately requested.
Merge pull request #247 from Drarok/drarok/remind-on-join

Deliver reminders when a user joins the channel, instead of waiting until they speak.
Add the ability for Phergie to only respond to targeted messages. That is, ones prefixed with the bot name.
Fix mixed config key names.
Explicitly load the Message plugin, but only when we require it.