Add more ruby specifications

to match official solarized as in previous pull request, helps #28 

before:
![screen shot 2014-12-12 at 3 44 56 pm](https://cloud.githubusercontent.com/assets/1993929/5420301/9b2ab5a8-8219-11e4-818d-eca260ef5944.png)

after:
![screen shot 2014-12-12 at 4 13 03 pm](https://cloud.githubusercontent.com/assets/1993929/5420327/eb39bd14-8219-11e4-9687-74508ee450f0.png)