Remove unused file.
Update composer information.
Rename test suite name.
Add Node model and test case.
Add comments.
Remove unused method.
Rename test table.
Remove Node model and test case.
Add Eloquent Node model and test cases.
Remove code that can't use on laravel project.
Remove unused attribute.
Fix behavior of 'delete' method.
Refactor 'delete' method.
Reformat code.
Remove unused code and file.
Replace 'DB::raw' with 'Query\Expression'.