Fix session.py to allow suppression of the cookie #737
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There are often endpoints/targets in your web.py app where you do not want to use sessions and most importantly, you do not want a Set-Cookie header sent with the response. The Set-Cookie header invalidates your Cache-Control directives when you are caching your responses with many CDNs. This PR allows you to do session.no_cookie=True in your handler to suppress the session cookie when you do not want it.