Inactive highlight

A much more subtle inactive highlight colour:

![screen shot 2014-06-05 at 14 48 11](https://cloud.githubusercontent.com/assets/760314/3188189/5e396aa0-ecb8-11e3-9a4c-4a65b35356f4.png)

For original bight green see: https://github.com/joeyfigaro/glacier-theme/issues/8