Refactor t/vstrings.t
Make EUMM prereqs work minus version-range if no CPAN::Meta::Requirements
Merge pull request #174 from mohawk2/cmrfallback

Make prereq-handling still work (minus version-range) if no CMR
Make EUMM::open_for_writing, exportable, to open utf8-encoded
Use intermediate perl scripts to generate META.* and *.ppd files