fuel/core — pull request #722 by kenjis (2011-12-11 04:31:15+00:00)
Title: fix namespace of HttpException

When loading httpexception.php, there is no alias \HttpException yet.
So it causes Class 'HttpException' not found Error.

How to reproduce:

app/myexception.php:

```php
class MyException extends \HttpException
{
...
}
```

```php
class Controller_Welcome extends Controller
{
public function action_index()
{
throw new MyException('...');
}
}
```