Update python brotli wrapper (#479) * Update python brotli wrapper * release GIL on CPU intensive blocks, fixes #476 * use BrotliDecoderTakeOutput (less memory, less memcpy) * Python: Convert bro.py tests to unittest style (#478) * Create unittest-style tests for `bro.py` decompression and compression * Delete old tests for `bro.py` * Update test method generation to properly create a Cartesian product of iterables using `itertools.product` * Update python brotli wrapper * release GIL on CPU intensive blocks, fixes #476 * use BrotliDecoderTakeOutput (less memory, less memcpy)