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`.

https://github.com/thoughtbot/factory_bot/blob/master/NAME.md

* 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