Update mustache.js to current stable version 0.7.2

Source: [mustache.js](https://github.com/janl/mustache.js/blob/master/mustache.js)
Downloaded source file and used [UglifyJS](http://marijnhaverbeke.nl/uglifyjs) to create [mustache.min.js](https://raw.github.com/uberbuilder/cdnjs/master/ajax/libs/mustache.js/0.7.2/mustache.min.js)

running `npm test` gives the ok [see the test results here](https://gist.github.com/uberbuilder/5018324)

Thank you for the repo, this is my first contribution.