Removes the use of the deprecated Box contructor with the mesh origin in HelloJME3. also updated the wiki

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@10716 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/test/jme3test/helloworld/HelloJME3.java

@@ -51,7 +51,7 @@ public class HelloJME3 extends SimpleApplication {
 
     @Override
     public void simpleInitApp() {
-        Box b = new Box(Vector3f.ZERO, 1, 1, 1); // create cube shape at the origin
+        Box b = new Box(1, 1, 1); // create cube shape
         Geometry geom = new Geometry("Box", b);  // create cube geometry from the shape
         Material mat = new Material(assetManager,
           "Common/MatDefs/Misc/Unshaded.j3md");  // create a simple material