few adjustments

Author: Cippo

InterfaceReference/Scripts/Attributes/Expose.cs

@@ -3,9 +3,12 @@
  */
 
 using CippSharp.Interfaces;
-using UnityEditor;
 using UnityEngine;
 
+#if UNITY_EDITOR
+using UnityEditor;
+#endif
+
 namespace CippSharp.Interfaces
 {
      public class ExposeAttribute : PropertyAttribute
@@ -19,7 +22,7 @@ public class ExposeAttribute : PropertyAttribute
 namespace CippSharpEditor.Interfaces
 {
     /// <summary>
-    /// Custom drawer of TypeFilterAttribute. 
+    /// Custom drawer of ExposeAttribute.
     /// </summary>
     [CustomPropertyDrawer(typeof(ExposeAttribute))]
     public class ExposeAttributeDrawer : PropertyDrawer

InterfaceReference/Scripts/Attributes/TypeFilter.cs

@@ -7,6 +7,7 @@
 using CippSharp.Interfaces;
 using UnityEngine;
 using Object = UnityEngine.Object;
+
 #if UNITY_EDITOR
 using UnityEditor;
 #endif
@@ -119,7 +120,7 @@ private void PreliminaryCheck(SerializedProperty property, Type[] requiredTypes)
                 }
                 else
                 {
-                    Debug.LogWarning("You must assign a gameObject that have at one component of the required types that you have specified.");
+                    Debug.LogWarning("You must assign a GameObject that has at least one component of the required types that you have specified.");
                 }
             }
         }

InterfaceReference/Scripts/EditorGUIUtils.cs

@@ -2,7 +2,6 @@
  *  Author: Alessandro Salani (Cippman)
  */
 
-
 using UnityEngine;
 #if UNITY_EDITOR
 using UnityEditor;

InterfaceReference/Scripts/Examples/ExposedInterfaceReference.cs

@@ -1,4 +1,8 @@
-using System;
+/*
+ *  Author: Alessandro Salani (Cippman)
+ */
+
+using System;
 using UnityEngine;
 
 namespace CippSharp.Interfaces.Examples