Revert "Move list-ops to the end." (#409)
Revert "Move list-ops to the end." (#409)

Forgot to wait for travis-ci to finish before merging.
NeimadTL/ruby,exercism/xruby,exercism/xruby,Insti/exercism-ruby,gchan/xruby,Insti/xruby,kotp/xruby,kotp/xruby,tommyschaefer/xruby,tommyschaefer/xruby,gchan/xruby,NeimadTL/ruby,Insti/exercism-ruby,Insti/exercism-ruby,NeimadTL/ruby,Insti/xruby