Still there are lots to do, but now we have the
Task behaviours defined better. Good for some
incoming changes, so we verify that everything is BC.

Also, fix test packages and class names and other small
details here and there.

Note that branch coverage with Jacoco is "crazy" and
requires to add a lot of combinations that we aren't
going to cover ever. So, basically, "yellow" lines are
ok.

Of course, we aren't covering here any script that would
require a running instance of Jenkins or proceed to mock
Jenkins stuff like crazy. Some day we, maybe, can advance
in that direction, but it's not a priority right now.