Use grid with container+row to make layout changes easier

Only aesthetics. Compare:

![fluid-full-width](https://cloud.githubusercontent.com/assets/11964/5010361/3b71cb42-6a72-11e4-9e63-d54640cea36e.png)

versus:

![more-padding](https://cloud.githubusercontent.com/assets/11964/5010362/3b75744a-6a72-11e4-879c-5675dc5dc2f9.png)