Download a file from the given url.
        Show a progress indicator for the download status.
        Based on: http://stackoverflow.com/a/15645088/1547223

def download(self, url, show_status=True):
        """
        Download a file from the given url.
        Show a progress indicator for the download status.
        Based on: http://stackoverflow.com/a/15645088/1547223
        """
        import requests

        file_name = url.split('/')[-1]
        file_path = os.path.join(self.data_directory, file_name)

        # Do not download the data if it already exists
        if self.is_downloaded(file_path):
            return file_path

        with open(file_path, 'wb') as open_file:
            print('Downloading %s' % url)
            response = requests.get(url, stream=True)
            total_length = response.headers.get('content-length')

            if total_length is None:
                # No content length header
                open_file.write(response.content)
            else:
                download = 0
                total_length = int(total_length)
                for data in response.iter_content(chunk_size=4096):
                    download += len(data)
                    open_file.write(data)
                    if show_status:
                        done = int(50 * download / total_length)
                        sys.stdout.write('\r[%s%s]' % ('=' * done, ' ' * (50 - done)))
                        sys.stdout.flush()

            # Add a new line after the download bar
            sys.stdout.write('\n')

        print('Download location: %s' % file_path)
        return file_path