Added SetBackground command and Background prefab.

Assets/Fungus/Dialog/Commands/SetBackground.cs

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+using UnityEngine;
+using System;
+using System.Collections;
+
+namespace Fungus
+{
+	[CommandInfo("Camera", 
+	             "Set Background", 
+	             "Draws a fullscreen background texture using a Background UI object.")]
+	public class SetBackground : Command 
+	{
+		public Background background;
+
+		public Sprite backgroundImage;
+
+		public override void OnEnter()
+		{
+			if (background != null)
+			{
+				background.SetBackgroundImage(backgroundImage);
+			}
+
+			Continue();
+		}
+
+		public override string GetSummary()
+		{
+			if (backgroundImage == null)
+			{
+				return "<None>";
+			}
+
+			return backgroundImage.name;
+		}
+
+		public override Color GetButtonColor()
+		{
+			return new Color32(216, 228, 170, 255);
+		}
+	}
+
+}

Assets/Fungus/Dialog/Commands/SetBackground.cs.meta

@@ -0,0 +1,8 @@
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+guid: 2d0318fa6f5b342c4abfe47bfd0ee062
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 

Assets/Fungus/Dialog/Prefabs/Background.prefab.meta

@@ -0,0 +1,4 @@
+fileFormatVersion: 2
+guid: a276a1108d4ee4da695983af7ae56c2e
+NativeFormatImporter:
+  userData: 

Assets/Fungus/Dialog/Scripts/Background.cs

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+using UnityEngine;
+using UnityEngine.UI;
+using System.Collections;
+
+public class Background : MonoBehaviour 
+{
+	public Canvas backgroundCanvas;
+	public Image backgroundImage;
+
+	public void SetBackgroundImage(Sprite imageSprite)
+	{
+		if (backgroundCanvas != null)
+		{
+			backgroundCanvas.gameObject.SetActive(imageSprite != null);
+		}
+
+		if (backgroundImage != null)
+		{
+			backgroundImage.sprite = imageSprite;
+		}
+	}
+}

Assets/Fungus/Dialog/Scripts/Background.cs.meta

@@ -0,0 +1,8 @@
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+guid: 41a94ec543d634ff782c8c704e8b6eb4
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+  serializedVersion: 2
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+  icon: {instanceID: 0}
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