ia.css - IA Pages Index - grey highlight on selected repo row

@russellholt @jagtalon The selected repo row should has grey highlight now. (Previously the highlight was only on the first row)

![screen shot 2014-12-04 at 13 35 55](https://cloud.githubusercontent.com/assets/3652195/5471172/a5d3b856-85f2-11e4-8f5e-bd374fd14165.png)