Clarify how to contribute
Add changelog entry for (Closes: #721348)
add a few bug templates for wheezy

Signed-off-by: Andreas Beckmann <anbe@debian.org>
scripts-leftovers: make init-system-helpers fake-essential

for purging configuration from /var/lib/systemd/

Signed-off-by: Andreas Beckmann <anbe@debian.org>