There seems to be garbage after \n\n within wsgi input

(Killed also some trailing whitespace while at it.)

I'm not sure why, but at end of requests there is \n\n + chr(0) within the string and ElementTree blows up. This fixes it, but not sure if this is really the way.

(Python 2.7.5 on OS X + 0.7.1 or develop branch, same result.)