code: protected function createRemoveRule(PackageInterface $package, $reason, $job)
      {
          return new GenericRule(array(-$package->id), $reason, $job['packageName'], $job);
      }
docs: Creates a rule to remove a package
  
  The rule for a package A is (-A).
  
  @param  PackageInterface $package The package to be removed
  @param  int              $reason  A RULE_* constant describing the
  reason for generating this rule
  @param  array            $job     The job this rule was created from
  @return Rule             The generated rule