Merge pull request OmniSharp#212 from NTaylorMullen/fixflush

Flush after writing.

Author: david-driscoll

src/JsonRpc/OutputHandler.cs

@@ -65,6 +65,8 @@ private void ProcessOutputQueue()
                                 _output.Write(ms.ToArray(), 0, (int)ms.Position);
                             }
                         }
+
+                        _output.Flush();
                     }
                 }
             }