Add support for auto-completion when using the container thanks to the latest PhpStorm beta

See https://confluence.jetbrains.com/display/PhpStorm/PhpStorm+Advanced+Metadata

For example:

```
$logger = StaticContainer::get('Psr\Log\LoggerInterface');
$logger->
```

The autocompletion would work based on the argument passed to `StaticContainer::get()`.
(cherry picked from commit 92960ac)