calculate list of modules in the caller, as it will vary depending on phase
this should be a private sub
New "check_all_prereqs" option
now works without duplicating prompts
and move private subs down
cache these module lists in attrs
test more vigorously for exact list of prompts
avoid dups between "module" and "check_all_plugins" lists
don't let warnings from upstream deps kill us! fail for authors only
skip "perl" from prereqs
Dist-Zilla-Plugin-PromptIfStale-0.004

          - New "check_all_prereqs" option
          - warnings tests bypassed during installation