raycast example, readme and changelog

Assets/IsoTools/Examples/Scripts/AlienDestroyer.cs

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+using UnityEngine;
+using System.Collections;
+
+namespace IsoTools.Examples {
+	public class AlienDestroyer : MonoBehaviour {
+		void Update () {
+			var iso_world = IsoWorld.Instance;
+			if ( iso_world && Input.GetMouseButtonDown(0) ) {
+				var iso_mouse_pos       = iso_world.MouseIsoPosition();
+				var ray_from_iso_camera = iso_world.RayFromIsoCameraToIsoPoint(iso_mouse_pos);
+				var hits                = iso_world.RaycastAll(ray_from_iso_camera);
+				foreach ( var hit in hits ) {
+					var alien_go = hit.collider.gameObject;
+					if ( alien_go.GetComponent<AlienBallController>() ) {
+						Destroy(alien_go);
+					}
+				}
+			}
+		}
+	}
+}

Assets/IsoTools/Examples/Scripts/AlienDestroyer.cs.meta

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+fileFormatVersion: 2
+guid: 5c7f5e2e35176448aa6e6cb2215e904d
+timeCreated: 1461944264
+licenseType: Free
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+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
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