Update data.py (#174)
Update data.py (#174)

Modify openface.data to deal with images with upper case extension
xinfang/face-recognize,Alexx-G/openface,cmusatyalab/openface,francisleunggie/openface,francisleunggie/openface,nmabhi/Webface,nmabhi/Webface,Alexx-G/openface,xinfang/face-recognize,xinfang/face-recognize,nmabhi/Webface,Alexx-G/openface,nmabhi/Webface,cmusatyalab/openface,francisleunggie/openface,cmusatyalab/openface,Alexx-G/openface