Remove unused variables/functions to fix luacheck warnings.
Remove unused variables/functions to fix luacheck warnings.

\cc @aaronnech

For #132

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