auth redirect URI's in the tutorial do not match app endpoints

[stepbot]

The bookshelf app auth tutorial instructs users to add http://localhost:8080/oauth2callback
and https://.appspot.com/oauth2callback to their authorized redirect URIs in the dashboard. These URI's do not match router endpoints in ./4-auth/lib/oauth2.js

Tutorial should be corrected to instruct users to add http://localhost:8080/auth/google/callback and https://.appspot.com/auth/google/callback instead.

[ace-n]

This has since been fixed. Thanks for reporting!