Improving About Us page

Merging the content of those pages:
http://helabs.com.br/sobre-nos/
http://helabs.com.br/valores/

.. and improving the layout.

@mergulhao @rafaelp 

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![about-us](https://f.cloud.github.com/assets/1587345/2412878/e523a742-aad7-11e3-8535-57703a306f05.png)