Changes to search result cover images and accordion sections display

* Adds max height to search result cover images (part of #668)
* Removes extra space in records above accordion sections on smaller screens (Reported by Jennifer)

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![image](https://cloud.githubusercontent.com/assets/302258/3913048/ae335cc8-2331-11e4-9c20-99df11274ee3.png)
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![image](https://cloud.githubusercontent.com/assets/302258/3913051/b4492e62-2331-11e4-87c8-5e07f4c30a00.png)