Bump MODULE_VERSION to 5.1.1

Change-Id: I76871708e861efc18786f12ac1bcd6156003e875
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Mark internal properties in FastBlur documentation.

Change-Id: Icebfba44bcf22e851b925f05546d46b26d4d5cae
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Fix domain in pngdumper.

Task-number: QTBUG-32390
Change-Id: Ia511663070b75fae7a2bef1ef16c12ac415facc6
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>