Initial add of pyliblzma, this is needed for hashdist itself
Initial add of xz utils (libxz, liblzma etc...)
Merge remote-tracking branch 'jcftang/wip-pyliblzma' into wip-xz
Get pyliblzml to depend on xz and setup PKG_CONFIG_PATH when xz is a build dep.
Merge pull request #316 from jcftang/wip-xz

Wip xz - merging as it appears to work on debian/ubuntu