Upgrade to Laravel 5.3

[kinow]

This has been released about one month or more ago. Let's upgrade to the latest and stable.

Docs for upgrading from 5.2 to 5.3:

https://laravel.com/docs/5.3/upgrade#upgrade-5.3.0

Notes on deprecated methods in 5.2 removed in 5.3:

https://laravel.com/docs/5.3/upgrade#5.2-deprecations

Bower and Composer were updated before. So now all that remains is following the documentation, testing locally, and then running the tests.

[kinow]

After following most of the instructions, and running composer update.

Call to undefined method Illuminate\Foundation\Support\Providers\AuthServiceProvider::boot() 

Removed the vendor folder, then removed the parent::boot call in that provider, re-run composer update, all good for now.

[kinow]

Application starts, but when signing in:

Undefined method Nestor\Http\Controllers\UsersController::isUsingThrottlesLoginsTrait

[kinow]

Migrations working fine.

[kinow]

All looks good for Laravel 5.3 now.