Allow custom comment for sources list
Merge pull request #311 from juniorsysadmin/custom-comment-for-sources-list

Allow for custom comment in sources.list file
Pin backports to 'release' instead of 'origin'

This allows backports to reside on the same origin, e.g. http.debian.net, without setting the pin priority to 200 for all repositories on http.debian.net.
first shot at a backports test