makefile : clean working and bin directory for output
Merge branch 'master' of https://github.com/H4305/RaspberryPiOS

Conflicts:
	Makefile
	kernel.elf
	kernel.hex
	kernel.img
	kernel.list
	os/hw.o
	os/kernel.o
	os/phyAlloc.o
	os/vectors.o
	sched/sched.o