Accessing to Handle for Streams

[katyo]

I trying to implement async versions of CaptureStream/OutputStream traits (i.e. with next function which returns Future).
I see that Stream types internally has reference to Handle but this ref hasn't accessible via public interface.
Also I see that Device type has function handle which returns reference to internal Handle.
How about adding similar functions to our stream types too?
I don't sure may we add it to Stream trait directly.
In any case I need a way to get file descriptors from streams.
Any ideas?

[raymanfx]

Sure, we can add a function to expose the Handle for now, analogous to the one for Device. Would you mind creating a pull request?