ActiveModel::Lint::Tests Passing

- Adding rails and sqlite3 gems to Gemfile, with dependencies in Gemfile.lock, in order
  to enable 'rails/test_helper' in test/test_helper.rb

- Adding in /config/
  * application.rb
  * boot.rb
  * database.yml
  * environment.rb

  * these are all required to run satisfy errors raised while running `rake test`

- Adding test_helper.rb to enable running in test environment

Adding Initial Code to Mixin Example Modules into Person Class for Testing

- Requiring loading of /lib files in /config/application.rb

- Converting attribute_methods.rb from class to module

- Moving minitest code from attribute_methods.rb to attribute_methods_test.rb

- Adding requirement of minitest to test_helper.rb