Remove staff.
Merge branch 'hft-stateless' into hft-dag

Conflicts:
	core/src/main/scala/varys/framework/scheduler/DarkScheduler.scala
Revert "Going back to 220b22be03766ca12cc852a1db90e4b2ab29dd8d"

This reverts commit 1d535922cbed6b79e6257e5a748273159569ecaa.

Conflicts:
	core/src/main/scala/varys/framework/scheduler/DarkScheduler.scala
	core/src/main/scala/varys/framework/slave/Slave.scala