Hot-fix for 4.7.0 (#300)

Disable ShaderGUI for build compilation error

Assets/Resources/Shader/GeometryGrassGUI.cs

@@ -1,6 +1,7 @@
 using UnityEngine;
 using UnityEditor;
 
+#if UNITY_EDITOR
 public class GeometryGrassGUI : ShaderGUI
 {
 	public override void OnGUI(MaterialEditor editor, MaterialProperty[] properties)
@@ -155,3 +156,4 @@ private void SetKeywordValue(string keyword, bool state, Material target)
 		}
 	}
 }
+#endif