Added operator.logical.ruby to keywords

Before:
![screen shot 2014-01-02 at 14 07 24](https://f.cloud.github.com/assets/178448/1832300/97bdfad4-73af-11e3-8255-29fc37049162.png)

After:
![screen shot 2014-01-02 at 14 07 37](https://f.cloud.github.com/assets/178448/1832302/9dd4a29c-73af-11e3-8bda-2f64f015ee68.png)