add testing suite

This uses the yeoman generator-test package.

To set up your tests, add your source file paths into "SpecRunner.html," and create a file in the test/specs folder.  Use the sellControllerSpecs.js file as a template; you'll need to create a mock controller and inject the dependencies in the specs you create.

I'm still working on getting testing for Parse functions to work, so I don't have a good example for that.