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These commits add better support for generating and serving files with custom or no filename extensions.

The tagger plugin can now generate archives without any filename extension if it is set to `null` in `site.yaml`:

    tagger:
        archives:
            all:
                extension:
                target: t
                …

The `hyde serve` command has a new argument to modify the MIME type extensions map. Example:

    hyde serve -t text/html -t text/plain .srt .asc -t application/x-xz .xz

This sets the default MIME type to `text/html` (rather than `application/octet-stream`) and maps `.srt` and `.asc` to `text/plain` and `.xz` to `application/x-xz`.