Upgrade the Laravel to version 5.4.
Optimize the directory structure.
Add a avatar function.
Add the validate for addGood form.
Adjust the frontend pages.
Other changes.
Controllers/GoodController: Finish the good function of our first step.
Controllers/UserController: Make session to be run rightly.
app/Http/routes.php: Add middleware web to every route.
database/migrations: Change column names such as 'good_id' to 'id'.
views/User.register: Add csrf_field to the form.
views/User.show: Add csrf_field to the form.
views/good: Finish the good function of our first step.