Add QtSensor changelog for Qt 5.3.0

Change-Id: I34160176dec6525e908956959c0749a199e45a2b
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Reviewed-by: Andrew Inwood <ainwood@blackberry.com>
Merge remote-tracking branch 'origin/release' into stable

Change-Id: I47951d3d277c1d2fc45a7ec36cc01d677ffec7cb