Introduce the list of versions that has been used for comparison as this might be different from the requested versions.
Introduce the list of versions that has been used for comparison
as this might be different from the requested versions.

If version 1.0.0 is requested and 1.0 of that gem is available,
SpecFetcher will fetch 1.0 so this change has to be reflected.

pombredanne/gem-compare,fedora-ruby/gem-compare