Merge pull request laravel#717 from barryvdh/feat-rebuild-2.0

[2.0] Rebuild for production

 recompile assets

Remove parentheses

 use property_exists

 recompile assets

 support apps that run carbon 1.0

 update carbon typehint

Revert "Change Carbon type hint to CarbonInterface" (laravel#576)

 update composer.json

formatting