doc: add Google Analytics tracking code
tests: kill all tpool workers in LimitedTestCase

Fixes GH-41 https://github.com/eventlet/eventlet/issues/41
wsgi: close timed out client connections
wsgi: pep8 whitespace
wsgi: configurable socket_timeout
greenio: socket pypy compatibility; Thanks to Alex Gaynor

https://bitbucket.org/eventlet/eventlet/issue/154/sockets-arent-compatible-with-pypy