Fixed issue #1118 - "search results overlap results header"

Added 8px margin-bottom. This was not added earlier thinking to utilize maximum real estate.
But looks ugly so fixed it.
It looks like below now after adding margin.
![margin](https://cloud.githubusercontent.com/assets/391355/5284203/c26716ba-7ae0-11e4-897e-3acd0671e085.png)