Enable authorization.
Add PaymentHistory Model.
Add link to /en/corrects into the sidenavi.
Add link to /en/corrects into the sidenavi.
Merge branch 'master' into payment
Fix DEPRECATION WARNING.
Merge branch 'master' into payment
Fix authorization check.
Merge branch 'master' into payment
Fix payment_histories index order.
Add Purchased Model and it's validations.
PaymentHistory has product name.
Add purchase page.
Fix partial view file name.
Refactoring layout file.
Student can purchase some points via PayPal.
Add Product model.
Admin can manage products. Student can choose product when purchase points.
Admin can manage products. Student can choose product when purchase points.
Add Payment test.