To preview the theme, place the contents on a webserver and visit http://webserver/dist/

For developing based on the theme you want to setup your workflow with the following steps:

make sure you have node.js installed (http://nodeguide.com/beginner.html)

$ npm install -g grunt-cli
$ npm install -g bower

With bower you can download the needed packages and with npm you need to download the grunt dependencies

$ cd /to/path/where Gruntfile.js and bower.json are located
$ npm install
$ bower install

You can use the grunt tasks to develop your own application To make changes and automatically compile your CSS run:

$ grunt

When you are done for a distribution of your own version run:

$ grunt dist