Landing updates

Fixing collapsing behavior on navbar, replacing Beta logo with 'prueba', troubleshooting the behavior of the landing page text, addressing various responsive navbar behaviors, adding credits to Brands of Puerto Rico.


![screen shot 2014-09-05 at 11 47 49 pm](https://cloud.githubusercontent.com/assets/1807325/4174466/cb72e2f0-3591-11e4-81ce-f84e9858d258.png)
![screen shot 2014-09-05 at 11 48 07 pm](https://cloud.githubusercontent.com/assets/1807325/4174469/ce64d306-3591-11e4-9e8a-626457aa0c2a.png)