Remove old color of body

* only visible in public view as ugly grey pane behind the footer

Before:
![ugly-grey-pane](https://cloud.githubusercontent.com/assets/245432/3776035/89b3bbb4-194e-11e4-817f-cec5e01b3061.png)

After:
![without-ugly-grey-pane](https://cloud.githubusercontent.com/assets/245432/3776038/8e34b0bc-194e-11e4-9486-8aac1679e780.png)

cc @owncloud/designers @fossxplorer @requist