Render flag status image for Twitter bot

Might be tricky to pull off, but a way to show the flagging statuses as a PNG that gets sent to Twitter would be neat.

My big worry about this is whether the code itself would be easy to maintain. Code involving rendering stuff in images tends to be pretty crazy and inscrutable. Is it worth the benefit if it can be simple and reliable? Possibly-- right now the Twitter bot's message is very uninformative (constraint of character limit).