Add Google oauth variable: hostedDomain

Which is part of `passport-google-oauth2`.
It could be used as whitelist to a domain supported by google oauth.
Ref: https://github.com/jaredhanson/passport-google-oauth2/issues/3

Signed-off-by: ike <developer@ikewat.com>

lib/web/auth/google/index.js

@@ -16,7 +16,7 @@ passport.use(new GoogleStrategy({
 }, passportGeneralCallback))
 
 googleAuth.get('/auth/google', function (req, res, next) {
-  passport.authenticate('google', { scope: ['profile'] })(req, res, next)
+  passport.authenticate('google', { scope: ['profile'], hostedDomain: config.google.hostedDomain })(req, res, next)
 })
 // google auth callback
 googleAuth.get('/auth/google/callback',