Create Task model
rake db:migrate
Create TasksController
Create tasks_controller_spec
Enable feature of create tasks
Update tasks_controller_spec
Enable feature of show task page
Update tasks_controller_spec
Enable feature of edit task
Update tasks_controller_spec
Enable feature of delete tasks
rake db:rollback STEP=1
Fix column achieve of task model add default value false
rake db:migrate
Merge pull request #6 from ahkr/feature/task

タスクの作成、編集、削除機能を追加