Updates find and replace preview pane

After a successful find and replace (when it finds any results) there is a preview, there are minor changes when comparing to sublime, there is a yellow outline instead of the white.

Here is the result:
![find and replace preview pane](https://f.cloud.github.com/assets/33835/2489019/defd0d2e-b151-11e3-81a5-7872fe757956.png)