Merge pull request #635 from hilary/refactor_slugify

generator: use file methods to manipulate filenames :)

Author: hilary

lib/generator/files/generator_cases.rb

@@ -24,7 +24,7 @@ def cases_filepaths(track_path)
         end
 
         def slugify(filepath)
-          %r{([^/]*)_case\.rb$}.match(filepath).captures[0].tr('_', '-')
+          File.basename(filepath, '_case.rb').tr('_', '-')
         end
 
         def filename(exercise_name_or_slug)