old_contents: from kivy.resources import resource_add_path
  resource_add_path(__path__[0] + '/assets')
  
new_contents: from kivy.resources import resource_add_path
  resource_add_path(__path__[0] + '/assets')
  
  __all__ = ['board', 'app', 'card', 'dialog', 'game', 'spritebuilder']
subject: Put __all__ into ELiDE.__init__