update docs to reflect our metrics
Avoid hardcoding metric names, to make it easier for Module::CPANTS::Analyse to alter what metrics are available
commit to give credit to Nathan Haigh for his patch in RT#27547
Merge branch 'topic/no_hardcoded_names'
done_testing requires Test::Builder 0.88
remove use of eval in examples
Test-Kwalitee-1.08

    - documentation fixed to reflect what indicators are actually available
    - metric names are no longer hardcoded, so Module::CPANTS::Analyse has
      more freedom to add and remove metrics