code: private Properties loadConfigurationProperties() {
          String configurationFileName = getConfigurationFileName();
          if (Strings.isNullOrEmpty(configurationFileName)) {
              log.info("JSLint property file not specified. Using default configuration.");
              return null;
          }
          return loadProperties(configurationFileName);
      }
docs: Load JSLint configuration property file specified by {@link GeneralOption#JSLINT_CONFIGURATION_FILE}
  configuration key
  
  @return a Properties instance