Add !uptime command

Torch.API/ITorchBase.cs

@@ -154,6 +154,8 @@ namespace Torch.API
         /// Raised when the server's Init() method has completed.
         /// </summary>
         event Action<ITorchServer> Initialized;
+        
+        TimeSpan ElapsedPlayTime { get; set; }
     }
 
     /// <summary>

Torch/Commands/TorchCommands.cs

@@ -290,5 +290,11 @@ namespace Torch.Commands
                 }
             }, this, TaskContinuationOptions.RunContinuationsAsynchronously);
         }
+
+        [Command("uptime", "Check how long the server has been online.")]
+        public void Uptime()
+        {
+            Context.Respond(((ITorchServer)Context.Torch).ElapsedPlayTime.ToString());
+        }
     }
 }