Specific version for rspec

works around a bug which currently installs prereleases in ruby where not desired,
and which would install rspec 2.99, breaking everything

See https://github.com/rubygems/rubygems/commit/d9c25c5
Adding ini format support for configrendering

references https://github.com/easybib/issues/issues/1179
Pleasing rubocop, refactoring for lower complexity
Merge pull request #321 from fh/t/config-ini

 Adding ini format support for configrendering