Include Changelog.yaml in the released tarballs

```
Hello,
it would be really nice to have the Changelog.yaml in the released tarballs, so 
that us packagers (in particular for Debian) can include that file in the 
packages we prepare.

Thanks for considering,
Sandro

```

Original issue reported on code.google.com by `sandro.tosi` on 22 Oct 2013 at 9:38
