Add colours in find-and-replace buttons

This will match the same colours used in SublimeText theme.
The buttons are rendered in blue and the options white / gray (active / inactive):

![screen shot 2014-03-19 at 14 33 51](https://f.cloud.github.com/assets/33835/2460506/695d3bb2-af6b-11e3-8a50-e4f937384ac1.png)