[INTERNAL] add project.internal (c'd d395a63)

IFollowModeChangesListener will be used in FollowingActivitiesManager.

Change-Id: Ia115096d61d92b0f72463b185b91b75d6b56bb39
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1712
Tested-by: Jenkins CI
Reviewed-by: Franz Zieris <zieris@inf.fu-berlin.de>