Fix recent movement of Account & User models

~dev_rating/application/classes/User.php

@@ -82,10 +82,9 @@ class User implements ArrayAccess
      * @return array  Пару вида <tt>(is_ok, err_msg)</tt>
      */
     public function signUp($code, $email, $login, $password) {
-        $model = &$this->_model;
         $account = Account::instance();
 
-        $isValid = $model->isActivationCodeValid($code);
+        $isValid = Model_Account::isActivationCodeValid($code);
         if (!$isValid) {
             return array(false, 'invalid_code');
         }
@@ -101,7 +100,7 @@ class User implements ArrayAccess
             }
         }
 
-        $id = $model->activateAccount($login, $password, $email, $code);
+        $id = Model_Account::activateAccount($login, $password, $email, $code);
         $this->completeSignIn($id, $this->hash($password));
         return array(true, 'ok');
     }