Moved project structure from Node.js app to Chrome Extension.  Removed no longer necessary Node dependencies.  Removed unnecessary code due to interacting directly with one board.  Added Gulp and Gulp-react to preprocess JSX files.
Changed app to use background page instead of popup to create a separate popup window to handle the print output.  Added options page with Trello auth logic to allow / deny access.
Updated install instructions for adding to Chrome.