implement Queue class
hw2-2 python done
Merge branch 'Dong-jin' of github.com:ycs-study/2014summer-oop into Dong-jin

Conflicts:
	hw2/hw2-2/python2-2/cpu.py
	hw2/hw2-2/python2-2/main.py
	hw2/hw2-2/python2-2/queue.py
done