First script for Stackoverflow quesiton: http://stackoverflow.com/questions/30852198/how-can-i-make-an-inserted-javascript-load-before-domcontentloaded

shim.js

(function(){
  var scriptTag = document.createElement('script');
  scriptTag.type = 'text/javascript';
  scriptTag.src = 'https://rawgit.com/javidjamae/a6945382f6d30c46ab5a/raw/7229b5ce14566b9658675dd1c8bf8a45bb0fb65a/second.js';
  scriptTag.async = true;
  document.getElementsByTagName('head')[0].appendChild(scriptTag);
})();