Feat/npm test

When testing in node, generator creates a ‘test’ script that runs the generated spec file.
Let’s users run tests with `npm test`
Also added a test for this functionality

![screen shot 2014-09-16 at 9 32 29 am](https://cloud.githubusercontent.com/assets/6556190/4290865/5e0a8da4-3dbf-11e4-938a-52df7da86430.png)