Add support for modules shared from dev.wikia.com

The solution bases on a "Dev:" prefix which works in require("Dev:ExampleModule"). The prefix is also used as a key for modules array that Lua loaders use. This prevents a name conflict since local modules are always in the NS_MODULE namespace and have "Module:" prefix.
Actually, you're wanting to check the string starts with the prefix, so this should be:
```php
strpos( $name, SHARED_MODULES_PREFIX  ) === 0
```

Otherwise, it will pass even if SHARED_MODULES_PREFIX is not at the start but for whatever reason is elsewhere in the name.