Annotated Eliza JS bot based on this which was based on this and http://en.wikipedia.org/wiki/ELIZA
Usage:
var elizabot = require('./elizabot.js');
elizabot.start() // initializes eliza and returns a greeting message
elizabot.reply(msgtext) // returns a eliza-like reply based on the message text passed into it
elizabot.bye() // returns a farewell message