/*
addRules

Add custom rules to the rule list and enable in the rule options hash.
function(additionalRules, opts) {
  if (check(additionalRules).is('undefined')) {
    return true;
  }

  if (check(additionalRules).is.not('object')) {
    logger.warn('Provide an mapping of custom rules');
    return false;
  }

  _.each(additionalRules, function(rule, ruleName) {
    if (check(rule).is.not('function') || check(ruleName).is.not('string')) {
      logger.warn('Invalid custom rule provided');
      return;
    }

    rules[ruleName] = rule;
    opts[ruleName] = opts[ruleName] || true;
  });

  return true;
}