completed within the tutorial

Revert "Force a login prompt during sign-in, fixes #590"

Force a login prompt during sign-in, fixes #590

Merge pull request #649 from firebase/deprecate-angular

delete cloud-functions-angular folders

Merge pull request #648 from firebase/codelab-update

update console log to functions logger

Update cloud-functions/functions/package.json

Update cloud-functions-start/functions/package.json

change console log to functions logger and update spawn to exec

change console log to functions logger and update spawn to exec

change console log to functions logger and update spawn to exec

change console log to functions logger and update spawn to exec

update codelab with newest Cloud Vision API

update codelab with newest Cloud Vision API