Return warning count also on DBH.
Merge pull request #20 from mbeijen/rt83352-warnings-from-dbh

Return warning count also on DBH.
Fix to https://rt.cpan.org/Ticket/Display.html?id=86153. Tests next on my list.
Added .mailmap file.
Fix manifest.
Improve documentation.
Improved Bundle description, it does not "include all that is needed."