Run Object.create(null) spec on all browsers not IE 8

IE 8 doesn't support Object.create so there shouldn't be a need to run this spec in IE 8

spec/core/PrettyPrintSpec.js

@@ -123,6 +123,8 @@ describe("j$.pp", function () {
   });
 
   it("should handle objects with null prototype", function() {
+    if (jasmine.getEnv().ieVersion < 9) { return; }
+
     var obj = Object.create(null);
     obj.foo = 'bar';