0.7.0

This release adds custom memory allocator support. Currently it is based on the GlobalAlloc trait. This is subject to change when the allocator_api gets stabilized.

The following new APIs were added:
DecompressorReader<R>::new_in
CompressorReader<R>::new_in
CompressorWriter<W>::new_in
DecompressorWriter<W>::new_in
BrotliDecoder::new_in
BrotliEncoder::new_in
BrotliDecoderOptions::build_in
BrotliEncoderOptions::build_in