[SàT dev]Implementation XEP-0184

[Goffi]

Le jeudi 28 juillet 2016, 19:23:01 CEST chteufleur a écrit :
> Hi !
> 
> [en]
> Here is an implementation for XEP-0184 (Message Delivery Receipts).
> 
> [fr]
> Voici une implémentation pour la XEP-0184 (Message Delivery Receipts).
> 
> 
> ++
> Geoffrey

applied thanks

I have corrected a small typo in Privacy, and removed unused imports.

I've also made a quick handling in primitivus, but it may need improvments in 
the future.

As we said on sat@ room, if may be nice to send a messageState signal with an 
error status if the ack was not received after the timeout.

Anyway, it's a great addition, thanks for your contribution :)

Goffi