Simplify cache disabling headers.

This patch changes the headers sent to prevent errornous caching of the
responses sent to only use a single header:

   Cache-Control: private, must-revalidate

This single header should ensure that the data isn't shared between
multiple users, and that the browser checks that the content is still
valid for each request (enabling logout to work as expected).

This drops the Exires-header, which should be unnecessary since all
modern browsers support the Cache-Control-header.

Thanks to Arthur Müller for providing this patch.

git-svn-id: https://modmellon.googlecode.com/svn/trunk@223 a716ebb1-153a-0410-b759-cfb97c6a1b53

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