Fixes to throws of Exception

src/GitHub.Api/Events/RepositoryWatcher.cs

@@ -78,7 +78,7 @@ public void Start()
             if (nativeInterface == null)
             {
                 Logger.Warning("NativeInterface is null");
-                throw new Exception("Not initialized");
+                throw new InvalidOperationException("NativeInterface is null");
             }
 
             running = true;

src/GitHub.Api/OutputProcessors/StatusOutputProcessor.cs

@@ -66,7 +66,7 @@ public override void LineReceived(string line)
                                 }
                                 else
                                 {
-                                    throw new Exception("Unexpected deltaComponent in o");
+                                    throw new InvalidOperationException("Unexpected deltaComponent in o");
                                 }
                             }
                         }