Added missing copyright headers

Assets/Fungus/Scripts/Editor/DialogInputEditor.cs

@@ -1,5 +1,5 @@
-using UnityEngine;
-using System.Collections;
+// This code is part of the Fungus library (http://fungusgames.com) maintained by Chris Gregan (http://twitter.com/gofungus).
+// It is released for free under the MIT open source license (https://github.com/snozbot/fungus/blob/master/LICENSE)
 
 namespace Fungus.EditorUtils
 {

Assets/Fungus/Scripts/Signals/BlockSignals.cs

@@ -1,4 +1,5 @@
-using Fungus.Utils;
+// This code is part of the Fungus library (http://fungusgames.com) maintained by Chris Gregan (http://twitter.com/gofungus).
+// It is released for free under the MIT open source license (https://github.com/snozbot/fungus/blob/master/LICENSE)
 
 namespace Fungus
 {

Assets/Fungus/Scripts/Signals/WriterSignals.cs

@@ -1,5 +1,6 @@
-using UnityEngine;
-using System.Collections;
+// This code is part of the Fungus library (http://fungusgames.com) maintained by Chris Gregan (http://twitter.com/gofungus).
+// It is released for free under the MIT open source license (https://github.com/snozbot/fungus/blob/master/LICENSE)
+
 using Fungus.Utils;
 
 namespace Fungus

Assets/Tests/Signals/BlockSignalsTester.cs

@@ -1,4 +1,7 @@
-using UnityEngine;
+// This code is part of the Fungus library (http://fungusgames.com) maintained by Chris Gregan (http://twitter.com/gofungus).
+// It is released for free under the MIT open source license (https://github.com/snozbot/fungus/blob/master/LICENSE)
+
+using UnityEngine;
 using System.Collections;
 using Fungus.Commands;
 

Assets/Tests/Signals/WriterSignalsTester.cs

@@ -1,4 +1,7 @@
-using UnityEngine;
+// This code is part of the Fungus library (http://fungusgames.com) maintained by Chris Gregan (http://twitter.com/gofungus).
+// It is released for free under the MIT open source license (https://github.com/snozbot/fungus/blob/master/LICENSE)
+
+using UnityEngine;
 using Fungus.Utils;
 
 namespace Fungus