Refactoring, mostly changing to CSS selectors

 to make tests a bit more robust. Adding more capabilities to the Article class for tests.

![post-21345-guinea-pigs-chewing-gif-nom-no-nayk](https://cloud.githubusercontent.com/assets/6571215/3052302/d45717c6-e198-11e3-8d6a-75aacd06912f.gif)