Go parallel gzip compression/decompression. This is a fully gzip compatible drop
in replacement for "compress/gzip".
This will split compression into blocks that are compressed in parallel. This
can be useful for compressing big amounts of data. The output is a standard gzip
file.
The gzip decompression is modified so it decompresses ahead of the current
reader. This means that reads will be non-blocking if the decompressor can keep
ahead of your code reading from it. CRC calculation also takes place in a
separate goroutine.
