Scaffoldを実行

- rails g scaffold User password:string
- rails g scaffold Questionnaire fixed_date:date owner_id:integer
- rails g scaffold Question question:text format:string upper_limit:integer depend_id:integer depend_pattern:string questionnaire_id:integer
- rails g scaffold Answer text:text join_id:integer questionnaire_id:integer question_id:integer
- rails g scaffold Request answer_date:date user_id:integer questionnaire_id:integer
- rake db:migrate