In AnnotateRoutes, there were many public methods that is not used in other classes or modules.

Before my extension, I made these methods private and sort them in order of appearance.

All tests were passed.

Please trace each commits carefully. I didn't nothing special. The commits consist of coordinating code.

Add --frozen option to abort instead of write annotation.
This is mainly for CI environment to detect missing annotation.
Similar motivation with bundle install --frozen.

works like:
```
$ rake db:migrate frozen=yes

annotate error. spec/models/user_spec.rb needs to be updated, but annotate was run with `--frozen
```

Since Rails full engines run as non-namespaced applications but all their app-related tasks still prefixed with `app:`

- Use Rake::Task#enhance insteaad of defining same tasks again
- Remove hooking db:migrate:change task which doesn't exist
- Fix hooking db:migrate:reset task so that the annotation runs after
  all migration tasks (#548)

This fixes alignment of Japanese, Korean and Chinese fullwidth character comments.

The displayed widths of multi-byte fullwidth characters are generally
twice as large as the ASCII characters, but String#size returns only the number of characters.
So if the column comment contains fullwidth multibyte characters, the alignment is broken.

* refactor and simplify returns for annotate_one_file
* fix rubocop offenses

In rails 4, columns do not respond to `bigint?`.  However, in both rails
4 and rails 5, columns do respond to `sql_type`. This way, annotations
should work in both versions.

* :with_comment option is flag
* It should use `true?` instead of `fallback`.

* Hook up with-comment option to rake tasks and CL.
* with_comment option handles commentless columns.
* Style fixes.

* Refactor AnnotateModels#get_model_files
* Add the tests for `AnnotateModels#get_model_files`
* Remove unnecessary `reject` call

Fix #436 where extra line break is added when using windows CRLF (#490)

* Fix InstallGenerator to require annotate
* Fix README

* annotate --routes modifies only routes.rb

This change is a proposed solution to #357 and an alternative to the already proposed solution #361.
In #361 it is needed to call `annotate --routes --ignore-models` to achieve the same as in this change with only `annotate --routes`.

* Call eager_load only when models are included

This to prevent activerecord model errors when using mongoid for example and calling `annotate --routes`