Add changelog file for 1.0.4 version

Change-Id: Id770b46babf6cd5ba25d658b6f3f86736c137cde
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Doc: Adding link to the "Enginio Namespace" page.

-Enginio namespace wasn't included and detected by QDoc as part of the
group/module.

Task-number: QTBUG-33360
Change-Id: If1f2af0ef82895f2c50f1a60fcfc3e5916c74449
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>