Description:
  Generates (but does not run) a migration to add a versions table. Also generates an initializer
  file for configuring PaperTrail. Can be customized by providing a Version class name.
  See section 5.c. Generators in README.md for more information.

Examples:
  rails generate paper_trail:install

  This will create:
    db/migrate/[TIMESTAMP]_create_versions.rb
    config/initializers/paper_trail.rb

  rails generate paper_trail:install --with-changes

  This will create:
    db/migrate/[TIMESTAMP]_create_versions.rb
    db/migrate/[TIMESTAMP]_add_object_changes_to_versions.rb
    config/initializers/paper_trail.rb

  rails generate paper_trail:install CommentVersion

  This will create:
    db/migrate/[TIMESTAMP]_create_comment_versions.rb
    config/initializers/paper_trail.rb

  rails generate paper_trail:install ProductVersion --with-changes --uuid

  This will create:
    db/migrate/[TIMESTAMP]_create_product_versions.rb
    db/migrate/[TIMESTAMP]_add_object_changes_to_product_versions.rb
    config/initializers/paper_trail.rb
