'Store cache of image in cache dir
:param image_url: Source URL'

def cache_image(self, image_url):

    path = ek(os.path.abspath, ek(os.path.join, sickbeard.CACHE_DIR, u'images', u'imdb_popular'))
    if (not ek(os.path.exists, path)):
        ek(os.makedirs, path)
    full_path = ek(os.path.join, path, ek(os.path.basename, image_url))
    if (not ek(os.path.isfile, full_path)):
        helpers.download_file(image_url, full_path, session=self.session)
