Add request links to availability on search results.


#### Location level request links
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![location-level-request-links](https://cloud.githubusercontent.com/assets/96776/3415125/57f08d06-fe1d-11e3-9252-3397df702dc3.png)


#### Item level request links
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![item-level-request-links](https://cloud.githubusercontent.com/assets/96776/3415119/48491f8a-fe1d-11e3-936f-c40031db84b8.png)