Added Karma with coverage

Here is an example of coverage working...

There are a few pieces of configuration for karma that you have to make sure that you get.

1. reporters
2. preprocessors
3. coverageReporter
4. plugins

For this specific example you probably want to build (at least for your tests) your application code and dependency code into separate files so you can run the coverage preprocessor only on your code and not jquery/ember/handlebars etc.

I hope this helps!