Auto detect xz compression for input and output

Note that the compression is much slower than with gz, because
the xz compressor cannot yet run multi-threaded. However, xz compression
is typically much better.

Change-Id: Ia8bc7f6238f3c6367fd78ab45d37d2485090ef6f
5 files changed
tree: cf61fceea236ac78a4db5b118ba751b664ccd140
  1. src/
  2. .gitignore
  3. CHANGELOG.md
  4. pom.xml