Update release information files. * Combined AUTHORS and CONTRIBUTORS. * Added some more folks to the AUTHORS file based on commit history. * Added Makefile recipe to dynamically generate ChangeLog from last annotated tag or a specified ref. * Added ignores for tarballs and ChangeLog.

#!/bin/sh
# Run this to generate all the initial makefiles, etc.

: ${AUTORECONF=autoreconf}
: ${GTKDOCIZE=gtkdocize}

$GTKDOCIZE || exit 1
$AUTORECONF --install || exit 1