Based on Ryan's feedback, switch to a STDERR output and non-fatal mode if the underlying platform can't run 'osxsierra'.
Based on Ryan's feedback, switch to a STDERR output and non-fatal mode if the underlying platform can't run 'osxsierra'.

I mean, not _everyone_ has a Mac...  :sadpanda

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp