vim fails to generate 'use statements' for namespaces

When the **namespace declaration** is written alongside the `<?php` tag, calling the plugin doesn't work at all. 

For Example:

<?php namespace Foo\Demo; // This DOESN't work

BUT when i put the **namespace declaration** tlike this

<?php

namespace Foo\Demo;

It wored flawlessly though.

This plugin probably requires that the namespace declaration on a different line.
