laravel/laravel — pull request #2354 by s-e (2013-10-12 00:37:58+00:00)
Title: Fixes assumptions about dependencies

This resulted in a fatal error due to missing dependencies if someone was running composer update for the first time without having already run composer install (symfony console would not be available). Thanks to @igorw: "the real problem here is that composer does not make any assumptions about the state of vendor before updating, and therefore scripts that run before install/update, must not either"