fix(build): make e2e tests faster

Closes #3822

protractor-shared.js

@@ -192,7 +192,7 @@ function patchProtractorWait(browser) {
   var sleepInterval = process.env.TRAVIS || process.env.JENKINS_URL ? 14000 : 8000;
   browser.get = function() {
     var result = _get.apply(this, arguments);
-    browser.sleep(sleepInterval);
+    browser.driver.wait(protractor.until.elementLocated(By.js('var cs = document.body.children; var isLoading = false; for (var i = 0; i < cs.length; i++) {if (cs[i].textContent.indexOf("Loading...") > -1) isLoading = true; } return !isLoading ? document.body.children : null')), sleepInterval);
     return result;
   }
 }