reduce left padding of brand. fixes #17

Remove left padding of brand and extend red bar to the sides on small screens. Adjust `.container` padding to compensate.
![screen shot 2013-09-03 at 12 32 59 pm](https://f.cloud.github.com/assets/2559233/1074286/02c2b2aa-14b7-11e3-804a-805b90a199b0.png)
![screen shot 2013-09-03 at 12 33 13 pm](https://f.cloud.github.com/assets/2559233/1074287/02c68272-14b7-11e3-99da-7f442dbcdb9e.png)