Presents a wireframe for signing up.

This wireframes shows what is expected from the index which is
also a sign up page.

Página de introdução:
![index](https://cloud.githubusercontent.com/assets/168136/2689848/75f656d2-c321-11e3-890c-d4e944206353.png)

Página de confirmação de inscrição:
![signup-confirmation](https://cloud.githubusercontent.com/assets/168136/2689849/7f634f90-c321-11e3-9b2e-be35bae234db.png)

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