Laravel 5.3 Package Shift

[awjudd]

This pull request includes the changes for upgrading your Laravel Package to Laravel 5.3. Feel free to commit any additional changes to the laravel-package-5.3-shift branch.

Before merging, you should:

• Checkout the laravel-package-5.3-shift branch
• Review all pull request comments for additional changes
• Run composer update (if the pre-commands fail, add --no-scripts)
• Thoroughly test your code

This Shift is still in beta. If there were changes you feel could have been automated, please leave a comment on this pull request to help improve Laravel Shift.