[RFC] Make Python 2.5 minimum version for dev tools (including test suite)

I find myself wanting to use the 'with' statement in the test suite,
which was introduced in Python 2.5 Python 2.5 was released 5.5 years
ago, and while I'm sure somebody on some archaic platform somewhere
doesn't have it installed, I think we can reasonably assume that
Python 2.5 is generally available. For reference, we currently
require and SQLite that is only 2.5-years-old.

(And for the historically minded among us, let's please don't repeat
the same bikeshed we had when we bumped to Python 2.4 3 years ago:
http://svn.haxx.se/dev/archive-2009-01/0266.shtml)

I would like to recommend we bump our minimum required version for the
test suite and development tools to Python 2.5.

Thoughts?

-Hyrum

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