Merge pull request #180 from Vesuri/compositordbus

[lipstick] Move the compositor D-Bus service to org.nemomobile.compositor
Bump version
[lipstick] Put common objects into the root context of the engine so that they're available from all windows
Bump version
Port lipstick to the lastest QtWayland API
Implement the sailfish_shell protocol
Add a protocol to be used by Alien
Make sailfish_shell and alien_manager share a common base