Bump module version to 5.4.0

Change-Id: Iba0502c83eb32f24691a4c0645ba1434033bfbc4
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Pin qtbase in order to allow for the qtbase stable -> dev merge to go through

The merge contains internal API changes that will break the qtdeclarative
build until qtdeclarative is also brought up-to-date.

Change-Id: Ib511f4deacc9eaa852a392b8f13bd3b034d6f454
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>