Verify if added references have to be in the same directory

Let's imagine that we run:

```
Runner.exe some.dll dir/other.dll
```

As a result we'll have:

```
build
-> some.dll
-> dir/other.dll
-> Migrant.dll
-> Writer.dll
-> other stuff
```

Will it work for other.dll?

What if we add only dir/other.dll? Currently we recreate the directory structure (not perfectly tough).
