Description: The pybox2d package uses an idiom for **kwargs handling that is not valid in python3.3.3

Additional info:
* package version(s):
python 3.3.3-1
python-pybox2d 370-1

The upstream uses the following idiom all over the place:
def test(**kwargs):
for key, value in kwargs.iteritems():
print(key)
test()

In python3 this results in:
AttributeError: 'dict' object has no attribute 'iteritems'

but in python2.7 there's no problem.

Sorry to make this issue critical but since it renders the package completely unusable I think it is justified.
I also checked the latest upstream sources and they have the same issue which is not surprising since there have been only minor updates since this package was created.

Steps to reproduce:
1) Install python-pybox2d
2) run the hello world example from upstream: http://code.google.com/p/pybox2d/source/browse/trunk/examples/hello.py
2 alternate)
# Enter this:
import Box2D
world=Box2D.b2World()
# end
3) Get the following error:
Traceback (most recent call last):
File "examples/hello.py", line 14, in <module>
world=b2World() # default gravity is (0,-10) and doSleep is True
File "/usr/lib/python3.3/site-packages/Box2D-2.3b0-py3.3-linux-x86_64.egg/Box2D/Box2D.py", line 4625, in __init__
for key, value in kwargs.iteritems():
AttributeError: 'dict' object has no attribute 'iteritems'