Prototype of Blanket coverage

Hi there,

   Just as a follow up of your Stack Overflow question, I wanted to show you what can provide Blanket.

   You will find a few modification to your project as a prototype.
   This add the command ```gulp coverage``` that will run a simple code coverage alongside your tests and print a Html file as an output.

   Running ```gulp coverage > coverage.html``` will render the sample file present in the commit.

![slection_001](https://cloud.githubusercontent.com/assets/661901/3517274/036dd64e-06ec-11e4-8c1f-d54b52ddc021.jpg)

   You would probably need to remove the specs from the sources to remove them from the coverage percentage but it gives you an idea about what I was talking.

   It is probably not what you need as it shows the covered Javascript lines (And not the Coffee ones) but I would be glad if you could explain what you were expecting :)
   Always nice to try to figure out problems !

Aurélien