Update renderjs and test to avoid renderjs-in-site check

renderjs.js

@@ -9,10 +9,6 @@
            Node, FileReader, Blob, navigator, Event, URL) {
   "use strict";
 
-  if (window.hasOwnProperty("renderJS")) {
-    return;
-  }
-
   function readBlobAsDataURL(blob) {
     var fr = new FileReader();
     return new RSVP.Promise(function (resolve, reject) {

test/inject_script.js

@@ -9,5 +9,5 @@ function inject_script(src, resolve) {
     resolve();
   };
   script.src = src;
-  document.body.appendChild(script);
+  document.head.appendChild(script);
 }