changed linear interpolation to nearest and added rube ragdoll with testbed in lab

lab/rube/js/ragdoll.js

@@ -0,0 +1,40 @@
+
+var ragdoll = function() {
+    //constructor
+}
+
+ragdoll.prototype.setNiceViewCenter = function() {
+    //called once when the user changes to this test from another test
+    PTM = 70;
+    setViewCenterWorld( new b2Vec2(0, 1), true );
+}
+
+ragdoll.prototype.setup = function() {
+    //set up the Box2D scene here - the world is already created
+    
+    var c = document.getElementById('canvas');
+
+    var ctx = c.getContext("2d");
+    if(ctx) {
+        ctx.imageSmoothingEnabled = false;
+        ctx.mozImageSmoothingEnabled = false;
+        ctx.webkitImageSmoothingEnabled = false;
+    }
+    setTimeout(function(){
+    	document.getElementById('drawShapesCheck').checked = false;
+    	updateWorldFromDebugDrawCheckboxes();
+    }, 10);
+    
+
+    if ( loadSceneFromRUBE(ragdoll_scene) ) //jack_scene is defined in jack-min.js
+        console.log("RUBE scene loaded successfully.");
+    else
+        console.log("Failed to load RUBE scene");
+        
+    doAfterLoading();
+    
+}
+
+ragdoll.prototype.getComments = function(canvas, evt) {
+    return "Created in R.U.B.E editor. Pull the latch to the side to open the box.";
+}