[SQLObject] Support for later pytest versions

[Neil M. <drn...@gm...>]

The attached patch reworks SQLObject's test suite to be runnable with pytest 2.

With this patch, I get identical results running the test suite with
pytest 1.3.4 and pytest 2.0.3 against sqlite using python 2.7, and I
can also run the test suite against pypy, although there are several
failures on the pypy run that I still need to investigate.

-- 
Neil Muller
drn...@gm...

I've got a gmail account. Why haven't I become cool?