fixes for new polling setup

update database model for alias (nullable ip)
heartbeats now send ip to master server

Application/API/Master/ApiServer.cs

@@ -9,6 +9,8 @@ namespace IW4MAdmin.Application.API.Master
     {
         [JsonProperty("id")]
         public int Id { get; set; }
+        [JsonProperty("ip")]
+        public string IPAddress { get; set; }
         [JsonProperty("port")]
         public short Port { get; set; }
         [JsonProperty("gametype")]

Application/API/Master/Heartbeat.cs

@@ -44,7 +44,8 @@ namespace IW4MAdmin.Application.API.Master
                                 Map = s.CurrentMap.Name,
                                 MaxClientNum = s.MaxClients,
                                 Id = s.GetHashCode(),
-                                Port = (short)s.GetPort()
+                                Port = (short)s.GetPort(),
+                                IPAddress = s.IP
                             }).ToList()
             };