suggestion: response.uncacheable() should send expires header

uncacheable() sends a Cache-Control header for HTTP 1.1 clients and a 
Pragma header for HTTP 1.0 clients. This is correct, but the HTTP 1.1 
spec advises sending an Expires header "whose value is less than or 
equal to the Date value" to indicate that HTTP 1.0 clients shouldn't 
cache the response. Reference:
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.3

Sending an Expires header makes sense, wouldn't hurt anything and might 
make uncacheable() more robust. All that's required in code is to call 
self.expires() in response.uncacheable().

Just a thought,
Philip


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