Update ruby generator (#442)
Update ruby generator (#442)

* Update ruby generator to use updated x-common exercises paths.

kotp/xruby,exercism/xruby,gchan/xruby,Insti/exercism-ruby,Insti/exercism-ruby,NeimadTL/ruby,NeimadTL/ruby,Insti/xruby,NeimadTL/ruby,tommyschaefer/xruby,tommyschaefer/xruby,exercism/xruby,Insti/exercism-ruby,kotp/xruby,Insti/xruby,gchan/xruby