Fixed error message for StaticAccess

This fixes #169.

Example code:
```php
<?php
class Baz {
    public static function qux()
    {

    }
}

class Foo {
    public function bar()
    {
        Baz::qux();
    }
}

$foo = new Foo;
$foo->bar();
```

Instead of `Avoid using static access to class '::' in method '::'.` it now outputs `Avoid using static access to class 'Baz' in method 'bar'.`