Fixed bug where last group in OBJ was not added.

examples/js/loaders/OBJMTLLoader.js

@@ -561,7 +561,10 @@ THREE.OBJMTLLoader.prototype = {
 			}
 
 		}
-
+		
+		//Add last object
+		meshN(undefined, undefined);
+		
 		return group;
 
 	}