Add FIOPS i/o scheduler

Would you be willing to add FIOPS, my favourite i/o scheduler.
I'm using SlimKernel now with it and it's running fine.

Test kernel: https://s.basketbuild.com/filedl/devs?dev=kantjer&dl=kantjer/bacon/SlimSaber%20kernel/SlimKernel-bacon-4.4.4-20141010.zip