[IronPython] wsgi.py update and codecs errors

[Christopher Baus]

>
> For your wsgi app were you using WSGI or WSGI-SI?

To get it running I am using WSGI, but I can already see the advantage of
using WSGI-SI and I'm probably going to move to that.  I made a couple
changes to WSGI.cs locally that I am testing out.

I thought about setting the environ variables from WSGI.cs directly, but I
saw Seo had already started working on the problem in wsgi.py, so that's
the direction I went.

http://baus.net/