[Merge] compiz:mitya57/xz-tarballs into compiz:master

[Dmitry Shachnev]

Dmitry Shachnev has proposed merging compiz:mitya57/xz-tarballs into compiz:master.

Requested reviews:
  Alberts Muktupāvels (muktupavels)
  Compiz Maintainers (compiz-team)

For more details, see:
https://code.launchpad.net/~compiz-team/compiz/+git/compiz/+merge/363208

More fixes related to tarballs generation.

- There are no advantages of .tar.bz2 over .tar.xz. The latter has higher compression ratios and faster decompression. It can be slower in compression but that does not matter for tarballs, as they are only compressed once. So let’s switch to .tar.xz.

- Git does not support .tar.xz out of the box (it only supports .tar.gz), so a config is needed. I had that locally so I did not notice it in the previous commit.

- Update release commands to work with .tar.xz tarballs.
-- 
Your team Compiz Maintainers is requested to review the proposed merge of compiz:mitya57/xz-tarballs into compiz:master.
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