Master has moved forward and we need to move the bbappends into the
yocto-edison folder. For the task-core-boot it has been renamed to
the packagegroup-core-boot and we do not need to increase the version
number for master.
The idea is that the basic extension resides inside the the normal
recipe directories. Depending on the version of poky the bbappends
need to be included. Appends applying to all versions will be put
into the shared folder, specific ones into the specific directory.
Once a bbappend can not be shared anymore it needs to be copied.