Add .env support to Laravel 4

It's very easy to port Laravel 5's way of handling environment files to Laravel 4.

You've got to require this package (it's that one that L5 uses): [code]composer require vlucas/phpdotenv```

And then you should update bootstrap/start.php:


...
$dotEnv = new Dotenv\Dotenv(__DIR__ . '/../');
$dotEnv->load();

$env = $app->detectEnvironment(function () {
    return getenv('APP_ENV') ?: 'production';
});
...

And boom, done! Now you can use an .env-file instead of .env.php.

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