grunt-js-test adoption

Convert SkinnyJS from using [grunt-mocha](https://github.com/kmiyashiro/grunt-mocha/) to [grunt-js-test](https://github.com/benhutchins/grunt-js-test/), the same module used by Studio and Checkout at Vistaprint.com

This will allow for changes to grunt-js-test in the future to be tested on a more thoroughly tested suite of JavaScript files, which will become important to both myself and to Tex for when changes are being made to grunt-js-test

Since grunt-js-test generates the HTML files and supports `<reference>` tags for JavaScript, CSS and HTML assets the wrapped up HTML files are no longer needed.

grunt-contrib-connect is also no longer needed, not even for testing locally, since grunt-js-test includes the `js-test-server` command which provides the same utility for development.