OpenID authentification (#170)

* openid authentification

* openid middleware

* openId login

* tidied login page

* removed useless email text field

server/config/config.go

@@ -22,6 +22,12 @@ type Config struct {
 	QueueSize       int    `yaml:"queue_size"`
 	SessionFilePath string `yaml:"session_file_path"`
 	path            string
+
+	UseOpenId          bool   `yaml:"use_openid"`
+	OpenIdProviderURL  string `yaml:"openid_provider_url"`
+	OpenIdClientId     string `yaml:"openid_client_id"`
+	OpenIdClientSecret string `yaml:"openid_client_secret"`
+	OpenIdRedirectURL  string `yaml:"openid_redirect_url"`
 }
 
 var (