Merged image coll

Closes #198 

### Search result
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![meged-image-collection-result](https://cloud.githubusercontent.com/assets/96776/3137535/f76709a6-e855-11e3-9ed5-998198384ae5.png)

### Record view
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![merged-image-collection-record](https://cloud.githubusercontent.com/assets/96776/3137536/007837f4-e856-11e3-852b-04fb9b22e533.png)