/**
  * Invite the user to a startup
  */
 public function invite()
 {
     $userTo = User::findOrFail(Input::get('user_id'));
     $startup = Startup::findOrFail(Input::get('startup_id'));
     $userFrom = Auth::user();
     ThreadRepository::notification('startup.join.invite.talent', $userTo, array('startup' => $startup, 'fromUser' => $userFrom));
     Flash::message('You have successfully invited ' . $userTo->profile->first_name);
     return Redirect::intended('/users/' . $userTo->id);
 }