Commits for t4deu

Descrive the --skip-view option of the action generator	hanami.github.io
Describe model generator in Command Line guide	hanami.github.io
Add destroy command for actions, models, migrations and mailers	hanami
Prevent generate migrations with same name	hanami
Refactors app and container generators	hanami
Refactors model, migration, mailer, action and app generators	hanami
Refactor the tests of commands "new" and "action"	hanami
Fixes the wrong specs path when generating app	hanami
Add database and architecture aliases to `lotus new` command	hanami
Initializes the git repository when generating application	hanami
Fix the error uninitialized constant Lotus::VERSION of app generator	hanami
Refactor the CLI for better maintainability	hanami