capping contributor image height from mobile

Moving the max-height to cover mobileLandscape breakpoint too.


Before
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![image](https://cloud.githubusercontent.com/assets/960919/3300249/caca97ec-f61e-11e3-8838-156732d07724.png)
After
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![image](https://cloud.githubusercontent.com/assets/960919/3300245/c151d126-f61e-11e3-888d-33bad18a61c7.png)