Fix regression in solarized theme introduced by  #1384

This for  #1261 that does not require adding more colors to the solarized color pallet. This fix uses selection color similar to how other editors (for example textmate do).
![screen shot 2014-05-19 at 14 55 53](https://cloud.githubusercontent.com/assets/21236/3020552/d901d832-dfa0-11e3-88fc-6aeb778341d7.png)
![screen shot 2014-05-19 at 14 56 10](https://cloud.githubusercontent.com/assets/21236/3020553/d902e146-dfa0-11e3-81bc-b6817f5b2b3f.png)