Replace deprecated Google OpenID authentication strategy with Oauth2
Fix npm shrinkwrap
Fix errors when Google Oauth client ID is not provided
Merge branch 'feature/google-auth' of github.com:smilledge/nodejs-cantas into smilledge-feature/google-auth

Conflicts:
	models/card.js
	npm-shrinkwrap.json
	package.json
	services/auth/strategies.js
Merge pull request #46 from xiaods/master

rebase #39  patch and merge it.