Merge pull request #57 from noodlesbad/master

refactored namings and updated to latest version lz4 and zstd libraries

release 4mc 2.2.0

Update Readme.md

Compatibility with newer Hadoop (2.7.x) and Spark (2.4.3)

more examples on ZSTD input/output

version 1.4.0

introduced DirectBufferPool to cope with nio.direct-buffers that can …

…cause OOM when GC is lazy: caching them is much better than letting GC free the object chain

minor fixes and new version

support hadoop-2

cosmetic