Added js and js_util to observatory deps

packages/js_util/dist/js_util.js

+(function (mod) {
+  if (typeof exports == "object" && typeof module == "object") // CommonJS
+      module.exports = mod();
+  else if (typeof define == "function" && define.amd) // AMD
+      return define([], mod);
+  else // Plain browser env
+      this.JsUtil = mod();
+})(function () {
+  "use strict";
+
+  function JsUtil() {
+  }
+
+  JsUtil.newObject = function () {
+    return {};
+  };
+
+  JsUtil.getValue = function (obj, prop) {
+    return obj[prop];
+  };
+
+  return JsUtil;
+});