In .gitignore don't ignore bin. This overrides setting in .gitignore_global.
Add lib/bs_ruby_sort/version.rb
Add bs_ruby_sort.gemspec
Change Gemfile to use bs_ruby_sort.gemspec
In array_sort_test.rb change from test/unit to minitest. Run bundle install --path vendor/bundle to install minitest. Let bundler update Gemfile.lock.

All unit tests pass.
Move array_sort.rb from lib to lib/bs_ruby_sort. All unit tests pass.
In README.md change headings.
Change from extending Ruby Array class to class BSArraySorter with class methods that operates on an array. This approach is less object oriented, more functional.

Rename array_sort.rb to bs_array_sorter.rb.
Rename array_sort_test.rb to bs_array_sorter_test.rb.
All tests pass.