Added webp information in doc and changelog

Change-Id: I1287608e914598c58acff70a47f71cc0bf36f094
Reviewed-by: Ivan Komissarov <ABBAPOH@gmail.com>
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: I7a67d831d24b298dbf48a6cac2c5f7e519a4616a
Remove unused and unlinked qdocconf file from the project.

Change-Id: I2d0b60c47d92ba82e04a0d90877bda6b287f5a85
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: I6a7d0055183a4bf7f850667d11a7dd0f477f4aa9