Updating dependencies and devDependencies in package.json

- Removed the year old yamljs library in the dependencies.
- Updated the version of the other dependencies.
- Added [![Dependency Status](https://david-dm.org/krasimir/absurd.png?theme=shields.io)](https://david-dm.org/krasimir/absurd) in the README.md.

Random note: I haven't tried using absurd with "--require coffee-script/register" in the parameters.