make it more clear that this isn't actually the finder we are using here
some core dzil plugins must be at 5.x, so this requirement is redundant now
clarify this comment
keep unwanted files out of the shipped dist

- run 'make clean' after the build finishes, too -- cleans up build artifacts
  left behind from generating docs so they don't get shipped
- wait for 'make clean' to finish before letting [GatherDir] grab everything
  (don't you love debugging race conditions? I sure do!)
- compare the built dist dir against our expected list of files to ensure that
  we didn't neglect to clean anything
be respectful of systems where make is not "make"
remove the package statement from this pod as well (done everywhere else in 2.1205)
switch to [Git::GatherDir] for even more surety that we do not package things we shouldn't