Change class of content's parent element from row to containter

Hi,
It seems there is a little mistake, parent element of content has a wrong class:

here we have the 'row' class:
![screenshot from 2014-08-04 12 49 36](https://cloud.githubusercontent.com/assets/1634282/3794920/67a3f1c0-1bb4-11e4-9134-d69f70cce1ff.png)

so I propose to use the 'container' class instead of it:
![screenshot from 2014-08-04 12 49 51](https://cloud.githubusercontent.com/assets/1634282/3794921/67a4a106-1bb4-11e4-99f7-db1929149e8f.png)

Thanks in advance!