Merge: Rename Streams

Since #466 is not closed yet, here's the follow-up to PR #932.

This one focuses only on introducing new names for Streams, IOS and its derivatives were judged as confusing, so here's a proposition of names for the different Streams of the standard library.

Please let me know if some names are not very explicit, I'll change them if necessary.

Pull-Request: #1153
Reviewed-by: Alexandre Terrasa <alexandre@moz-code.org>
Reviewed-by: Jean Privat <jean@pryen.org>
Reviewed-by: Alexis Laferrière <alexis.laf@xymus.net>