code: public JavascriptVarBuilder appendProperty(final String propertyName, final String propertyValue, final boolean quoted) {
          next();
          sb.append(propertyName);
          sb.append(":");
          appendText(propertyValue, quoted);
          return this;
      }
docs: Appends an Object name/value pair to the object.
  
  @param propertyName the property name
  @param propertyValue the property value
  @param quoted if true, the value is quoted and escaped.
  @return this builder