Try to convert annotations::getMethod name to lowercase for comparing

We all know name of class::method in php is not case-sensitive, so if you type: http://test.com/foo/bar/isadmin in your browser, and actually the class::method is ```\Foo\BarController::isAdminAction()```, this is all OK. But if I want to do something with ```dispatcher``` and ```annotation```, such as permissions validation, I would get nothing if I try to do  ```$annotation->getMethod("\Foo\BarController", "isadminAction")```.

This is what I did for permissions validation in ```disaptcher:beforeExecuteRoute``` event.

```php
public function beforeExecuteRoute(\Phalcon\Events\Event $event, \Phalcon\Mvc\Dispatcher $dispatcher)
    {
        $annotations = new \Phalcon\Annotations\Adapter\Memory();
        $anno = $annotations->getMethod($dispatcher->getActiveController(), $dispatcher->getActiveMethod());
        if($anno->count() == 0 || !$anno->has('acl')) {
            return true;
        }

        $aclAnno = $anno->get('acl');

        if($aclAnno->getNamedArgument("login") === true) {
            if(!$this->di->has('user')) {
                $this->needLogin();
                return false;
            }
        }

        if($aclAnno->getNamedArgument("auth") === true) {

            $list = $this->di->get('user')->getAcl("deleted = 0");
            if($list->count() == 0) {
                $this->needAuth();
                return false;
            }
            foreach ($list as $item) {
                $isOK = true;
                if($item->module != '*' && $this->module != $item->module) {
                    $isOK = false;
                    continue;
                }
                if($item->controller != '*' && $this->controller != $item->controller) {
                    $isOK = false;
                    continue;
                }
                if($item->action != '*' && $this->action != $item->action) {
                    $isOK = false;
                    continue;
                }
                if($isOK == true) return true;
            }

            $this->needAuth();
            return false;
        }

        return true;
    }
```
换成PHALCON_INIT_VAR(lowercased_method_name)，不然退出这个函数不会释放该内存