Gets x number of Google image result urls for
        a given search term.
        Arguments
        search_term: str
            tearm to search for
        num_results: int
            number of url results to return
        return ['url','url']

def search(self, search_term, num_results, **kwargs):
        """Gets x number of Google image result urls for
        a given search term.
        Arguments
        search_term: str
            tearm to search for
        num_results: int
            number of url results to return
        return ['url','url']
        """
        results = []
        count = 1
        try:
            while len(results) <= num_results:
                search_results = self.service.cse().list(
                    q=search_term,
                    cx=self.cse_id,
                    searchType="image",
                    fileType=self.file_type,
                    start=count,
                    **kwargs).execute()
                results.extend(
                    [r['link'] for r in search_results['items']])
                count += len(search_results)
            results = results[:num_results]
        except KeyError as e:
            logger.warning('Exception: %s', e)
        if len(results) == 0:
            raise ZeroResultsException("No images found")
        return(results)