def frameworks_group
      current_group = groups.group('Frameworks').first
      current_group.instance_eval(&block) if block_given? and current_group
      current_group
    end
def frameworks_group
      current_group = groups.group('Frameworks').first
      current_group.instance_eval(&block) if block_given? and current_group
      current_group
    end
Most Xcode projects have a Frameworks gorup where all the imported
 frameworks are shown. This will generate an exception if there is no
 Frameworks group.

 @return [Group] the 'Frameworks' group of the projet.