laravel/app/providers/ErrorServiceProvider.php

<?php namespace Providers;

use Illuminate\Support\ServiceProvider;

class ErrorServiceProvider extends ServiceProvider {

	/**
	 * Register any error handlers.
	 *
	 * @return void
	 */
	public function boot()
	{
		// Here you may handle any errors that occur in your application, including
		// logging them or displaying custom views for specific errors. You may
		// even register several error handlers to handle different types of
		// exceptions. If nothing is returned, the default error view is
		// shown, which includes a detailed stack trace during debug.

		$this->app->error(function(\Exception $exception, $code)
		{
			$this->app['log']->error($exception);
		});
	}

	/**
	 * Register the service provider.
	 *
	 * @return void
	 */
	public function register()
	{
		//
	}

}