[Maypole] content-type forced to text/html

[Simon Cozens]

Simon Flack:
> Another option I've been mulling over is to add File::Type or 
> File::MMagic to the list of dependencies, and auto-detect the mime type.

This is worth doing for things which have to be processed by Maypole, but it's
better (also) to use a handler which DECLINEs those files which don't need to
be processed.

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