Populate AUTHORS when distribute

Adds a complete list of contributors in a
distributed package.

Signed-off-by: Sahid Orentino Ferdjaoui <sahid.ferdjaoui@cloudwatt.com>
Populate ChangeLog when distribute

Generates ChangeLog from git history for a
distributed package.

Signed-off-by: Sahid Orentino Ferdjaoui <sahid.ferdjaoui@cloudwatt.com>
Merge pull request #1913 from sahid/dist

Populate AUTHORS and ChangeLog for a distributed package

Reviewed-by: Loic Dachary <loic@dachary.org>