Install nodejs and npm. On Mac OS X, the easiest way to accomplish this is with brew:
$ brew install node
If you prefer to install manually, head over to the node.js downloads page.
Next, install Gulp and Bower to get their CLI tools:
$ npm install -g gulp bower`
Finally, install the dependencies for the project:
$ npm install && bower install
$ gulp serve
This will start a local server to access the application. It will also watch for changes and automatically reload the page when necessary.
$ gulp build
$ gulp test