=head2 project_rewards

   my @rewards = $ks->project_rewards($project_id);
   my @rewards = $ks->project_rewards($project_slug);

Fetches and returns the rewards of the specified project as L<WWW::Kickstarter::Data::Reward> objects.

The argument may be the project's numerical id (as returned by L<C<< $project->id >>|WWW::Kickstarter::Data::Project/id>) or
its "slug" (as returned by L<C<< $project->slug >>|WWW::Kickstarter::Data::Project/slug>).

##</code><code>##

my @rewards = $ks->project_rewards($project_id);
my @rewards = $ks->project_rewards($project_slug);