Add non-default test code using hard negatives.
Add non-default test code using hard negatives.

nhzandi/openface,nmabhi/Webface,xinfang/face-recognize,nmabhi/Webface,xinfang/face-recognize,nmabhi/Webface,Alexx-G/openface,nhzandi/openface,Alexx-G/openface,francisleunggie/openface,cmusatyalab/openface,nhzandi/openface,cmusatyalab/openface,Alexx-G/openface,francisleunggie/openface,nmabhi/Webface,cmusatyalab/openface,Alexx-G/openface,francisleunggie/openface,xinfang/face-recognize