Updated composer.json to work with laravel 4.1

First time making a pull request, so I apologize if I've done anything incorrectly.    

    $user: /var/www/laravel$ composer update
    Loading composer repositories with package information
    Updating dependencies (including require-dev)
    Your requirements could not be resolved to an installable set of packages.

      Problem 1
        - Conclusion: remove laravel/framework v4.1.3
        - Conclusion: don't install laravel/framework v4.1.3
        - Installation request for atrauzzi/laravel-doctrine dev-master -> satisfiable by atrauzzi/laravel-doctrine[dev-master].
        - Conclusion: don't install laravel/framework v4.1.2
        - Conclusion: don't install laravel/framework v4.1.1
        - atrauzzi/laravel-doctrine dev-master requires illuminate/support 4.0.x -> satisfiable by laravel/framework[v4.0.0, v4.0.1, v4.0.10, v4.0.2, v4.0.3, v4.0.4, v4.0.5, v4.0.6, v4.0.7, v4.0.8, v4.0.9], illuminate/support[v4.0.0, v4.0.1, v4.0.10, v4.0.2, v4.0.3, v4.0.4, v4.0.5, v4.0.6, v4.0.7, v4.0.8, v4.0.9].
        - Can only install one of: laravel/framework[v4.1.0, v4.0.0].
        - Can only install one of: laravel/framework[v4.1.0, v4.0.1].
        - Can only install one of: laravel/framework[v4.1.0, v4.0.10].
        - Can only install one of: laravel/framework[v4.1.0, v4.0.2].
        - Can only install one of: laravel/framework[v4.1.0, v4.0.3].
        - Can only install one of: laravel/framework[v4.1.0, v4.0.4].
        - Can only install one of: laravel/framework[v4.1.0, v4.0.5].
        - Can only install one of: laravel/framework[v4.1.0, v4.0.6].
        - Can only install one of: laravel/framework[v4.1.0, v4.0.7].
        - Can only install one of: laravel/framework[v4.1.0, v4.0.8].
        - Can only install one of: laravel/framework[v4.1.0, v4.0.9].
        - don't install illuminate/support v4.0.0|don't install laravel/framework v4.1.0
        - don't install illuminate/support v4.0.1|don't install laravel/framework v4.1.0
        - don't install illuminate/support v4.0.10|don't install laravel/framework v4.1.0
        - don't install illuminate/support v4.0.2|don't install laravel/framework v4.1.0
        - don't install illuminate/support v4.0.3|don't install laravel/framework v4.1.0
        - don't install illuminate/support v4.0.4|don't install laravel/framework v4.1.0
        - don't install illuminate/support v4.0.5|don't install laravel/framework v4.1.0
        - don't install illuminate/support v4.0.6|don't install laravel/framework v4.1.0
        - don't install illuminate/support v4.0.7|don't install laravel/framework v4.1.0
        - don't install illuminate/support v4.0.8|don't install laravel/framework v4.1.0
        - don't install illuminate/support v4.0.9|don't install laravel/framework v4.1.0
        - Installation request for laravel/framework 4.1.* -> satisfiable by laravel/framework[v4.1.0, v4.1.1, v4.1.2, v4.1.3].


    $user: /var/www/laravel$ php -v
    PHP 5.4.9-4ubuntu2.3 (cli) (built: Sep  4 2013 19:32:25) 
    Copyright (c) 1997-2012 The PHP Group
    Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies
        with Xdebug v2.2.1, Copyright (c) 2002-2012, by Derick Rethans

And The composer.json file


	{
		"name": "laravel/laravel",
		"description": "The Laravel Framework.",
		"keywords": ["framework", "laravel"],
		"license": "MIT",
		"require": {
                 "laravel/framework": "4.1.*",
                 "atrauzzi/laravel-doctrine": "dev-master",
                 "doctrine/migrations": "dev-master",
		},
		"autoload": {
			"classmap": [
				"app/commands",
				"app/controllers",
				"app/models",
				"app/database/migrations",
				"app/database/seeds",
				"app/tests/TestCase.php"
			],
			"psr-0": {
				"SomeApp\\": "app/src/"
			}
		},
		"scripts": {
			"post-install-cmd": [
				"php artisan optimize"
			],
			"post-update-cmd": [
				"php artisan clear-compiled",
				"php artisan optimize"
			],
			"post-create-project-cmd": [
				"php artisan key:generate"
			]
		},
		"config": {
			"preferred-install": "dist"
		},
		"minimum-stability": "stable"
	}


I'm not certain, but it could be possible the fix is as simple as updating the Illuminate\Support [dependency](https://github.com/atrauzzi/laravel-doctrine/blob/master/composer.json#L14).

I manuallly copied your package into my vendor directory and update the composer.json file to use ``` "illuminate/support": "4.*.x", ``` and it appears everything was working fine like it did pre- 4.1