Remove det surgery

Notes:
* deploying this change will require some app downtime (probably several hours) as the `detection_extract_view_mv` needs to be re-built and re-indexed.
* this should fix #110 
![image](https://cloud.githubusercontent.com/assets/1849176/5022329/61c7418a-6b37-11e4-8425-aa6925ea9c86.png)