Created BetterTouchTool management from node (btt-node)

Hi there, I've created a small npm package that makes it a little bit easier to manage the endpoints provided by BTT Webserver. You can check it out here: https://github.com/worie/btt-node

This is a "code-while-in-a-train" project so perhaps it's not best documented yet, but should cover all endpoints provided by webserver so far :slight_smile: