Don't produce Gzipped tarballs

A quick note so I can delete it from my desktop. In order to produce only a Bzip2 tarball with the Autotools, specially when running make distcheck, set the automake init call with these parameters:

AM_INIT_AUTOMAKE([no-dist-gzip dist-bzip2])

By the way I wonder if it's worth dumping bzip2 against xz.