Give a permanent bg colour to facia and index pages

To stop text bleeding into page skin background if page hasn't switched to page skin mode

### Before

![screen shot 2014-12-17 at 10 27 03](https://cloud.githubusercontent.com/assets/74132/5469754/480822d6-85d7-11e4-892a-0e7287ad352d.png)

### After

![screen shot 2014-12-17 at 10 26 44](https://cloud.githubusercontent.com/assets/74132/5469755/4b5b79ec-85d7-11e4-8e1b-063836d8511b.png)