Remove hubot-scripts so I can remove node-stringprep
j/k bring back memecaptain, I love this one

This reverts commit bf08baf4a141361c5eb25418c75378ad444bc400.
Bring back hubot-scripts and our own hubot-scripts.json, sans shipit
Load stock scripts in hubot-scripts.json; update others to the latest
Add a rough draft markov bot I found on Gist