Implement Google OAuth2 authentication for CPAN
Fix missing deps and correct the name of the user_id field
Google requires more parameters during the auth redirect
Fix a missing semi
Working Google authentication, but...

It works, but the process doesn't finish with the user being authenticated on
MetaCPAN. Still need to work out that issue.
Remove warnings used for helping during development
Merge pull request #249 from zostay/google-auth

Google authentication for MetaCPAN