changing rich-link mobile styling

bringing mobile style more inline with other breakpoints

examples
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![image](https://cloud.githubusercontent.com/assets/960919/5410151/7b75fed2-81e9-11e4-9892-a5b433eccae2.png)

![image](https://cloud.githubusercontent.com/assets/960919/5410154/83efe9b0-81e9-11e4-85c7-4706aa578bb5.png)