Changed the preview of the recieved IRC Twitch message "PING!". Made it take up less of the screen.

I forgot to add a reply to Twitch's IRC "PING" message. If the bot doesn't reply to it, then the bot won't be able to read chat or reply / type in chat. Fixed it by sending back "PONG :tmi.twitch.tv\r\n" to Twitch.

Deleted non-existent commands from RubyTwitchChatBot template.
Added comments to clarify use.