email refacts trying to use creds

+ Admin user deletion from user list
+ Admin send email confirmation message from user list
+ WebSocket minor change

src/Yavsc.Server/Settings/SmtpSettings.cs

@@ -5,6 +5,8 @@ namespace  Yavsc
     {
         public string Host { get; set; }
         public int Port { get; set; }
+        public string UserName { get; set; }
+        public string Password { get; set; }
 
         public bool EnableSSL { get; set; }
     }