Added some functionality to FIFO.
Added functionality to FIFO and fixed a conflict.
Revert "Added some functionality to FIFO."

This reverts commit 250b72fefb4f360bb35b86b10215ec3940e0b538.

Conflicts:
	first-in-first-out.cpp
Merge branch 'master' of https://github.com/rapjac/cpu-scheduler