'Create subdirs in catalog output dir.
Create /content and /images in self.catalog_path
Inputs:
catalog_path (path): path to catalog output dir
Output:
/content, /images created'

def create_catalog_directory_structure(self):

    if (not os.path.isdir(self.catalog_path)):
        os.makedirs(self.catalog_path)
    content_path = (self.catalog_path + '/content')
    if (not os.path.isdir(content_path)):
        os.makedirs(content_path)
    images_path = (self.catalog_path + '/images')
    if (not os.path.isdir(images_path)):
        os.makedirs(images_path)
