add example of new particle edit JS api

examples/editParticleExample.js

@@ -0,0 +1,85 @@
+//
+//  editParticleExample.js
+//  hifi
+//
+//  Created by Brad Hefta-Gaub on 12/31/13.
+//  Copyright (c) 2013 HighFidelity, Inc. All rights reserved.
+//
+//  This is an example script that demonstrates creating and editing a particle
+//
+
+var count = 0;
+
+var originalProperties = {
+    position: { x: 1/TREE_SCALE,
+                y: 0/TREE_SCALE,
+                z: 1/TREE_SCALE },
+
+    velocity: { x: 0,
+                y: 0,
+                z: 0 },
+
+    gravity: { x: 0,
+                y: 0,
+                z: 0 },
+
+
+    radius : 0.1/TREE_SCALE,
+
+    color: { red: 0,
+             green: 255,
+             blue: 0 }
+
+};
+
+var positionDelta = { x: 0.5/TREE_SCALE, y: 0, z: 0 };
+
+
+var particleID = Particles.addParticle(originalProperties);
+
+function moveParticle() {
+    if (count >= 10) {
+        //Agent.stop();
+
+        // delete it...
+        if (count == 10) {
+            print("calling Particles.deleteParticle()");
+            Particles.deleteParticle(particleID);
+        }
+
+        // stop it...
+        if (count >= 100) {
+            print("calling Agent.stop()");
+            Agent.stop();
+        }
+
+        count++;
+        return; // break early
+    }
+
+    print("count =" + count);
+    count++;
+
+    print("particleID.creatorTokenID = " + particleID.creatorTokenID);
+
+    var newProperties = {
+        position: {
+                x: originalProperties.position.x + (count * positionDelta.x),
+                y: originalProperties.position.y + (count * positionDelta.y),
+                z: originalProperties.position.z + (count * positionDelta.z)
+        },
+        radius : 0.25/TREE_SCALE,
+
+    };
+
+
+    //print("particleID = " + particleID);
+    print("newProperties.position.x = " + newProperties.position.x);
+
+    Particles.editParticle(particleID, newProperties);
+}
+
+
+// register the call back so it fires before each data send
+Agent.willSendVisualDataCallback.connect(moveParticle);
+