public function store()
{
$promotion = new promotion();
$promotion->project_id = Auth::user()->curr_project_id;
$promotion->name = Input::get('name');
$promotion->description = Input::get('description');
$promotion->discount = Input::get('discount');
$promotion->nominal = Input::get('nominal');
$promotion->last_valid = Input::get('last_valid');
$promotion->save();
Session::flash('message', 'Sukses menambahkan promo baru');
}