Can we see you composer.json file?

Did you add the folders to the autoloader? Did you run composer dump-autoload?

Yes, I guess I did, here's the content of my composer.json file

{
	"name": "laravel/laravel",
	"description": "The Laravel Framework.",
	"keywords": ["framework", "laravel"],
	"license": "MIT",
	"require": {
		"laravel/framework": "4.2.*",
		"creolab/laravel-modules": "dev-master",
		"cartalyst/sentry": "2.1.*"
		
	},
	"require-dev": {
		"way/generators": "dev-master"
	},
	"autoload": {
		"classmap": [
			"app/commands",
			"app/controllers",
			"app/models",
			"app/database/migrations",
			"app/database/seeds",
			"app/tests/TestCase.php",

			"app/modules"
		],
		"psr-0": {
			"Prolife\\": "app/prolife"
		}
	},
	"scripts": {
		"post-install-cmd": [
			"php artisan clear-compiled",
			"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"
}

"psr-0": {
    "Prolife": "app/"
}

What you are using is psr-4

and run "composer dump-autoload" after

Thanks pogachar, I rolled back to psr-0 but the problem persists

ReflectionException (-1) 
Class Prolife\Events\MailSender does not exist