Change ListView Background

Basically, I just set the property setListViewBackground into the FadingActionBarHelper to be able to change the background of the ListView and keep the header visible.

![device-2013-07-16-012017](https://f.cloud.github.com/assets/1172221/801867/99b9a99c-edad-11e2-90d3-bafef219c479.png)
![device-2013-07-16-012000](https://f.cloud.github.com/assets/1172221/801868/99b87018-edad-11e2-9211-60c09068774d.png)