Some cleanups for the PyPy plugin:

a) pep8 and such
b) Made classes be newstyle
c) Made the classes be created once, not once per request
whoops, a few small fixse
Merge branch 'master' of https://github.com/unbit/uwsgi
Catch a more precise error
removed a method with a nonsense implementation
Merge pull request #288 from alex/pypy-cleanups

Some cleanups for the PyPy plugin: