Copy To Clipboard // from Avast extension

/**
     * Copy text provided into clipboard.
     * @param {String} text to copy to clipboard
     */
    copyToClipboard : function (text) {
      var body = document.getElementsByTagName('body');
      if (body.length > 0) {
        body = body[0];
        var copyFrom = document.createElement('textarea');
        copyFrom.value = text;
        body.appendChild(copyFrom);
        copyFrom.select();
        document.execCommand('copy', true);
        copyFrom.parentNode.removeChild(copyFrom);
      }
    },