Tidy up tutorial

paj avatarpaj created an issue

The tutorial includes code with the following comment. We should tidy this up so it's not necessary to override prepare() - the need to do this suggests a bug elsewhere.

            # This controller registration does not generally have to occur inside
            # 'prepare', but we place it here so we're sure the middleware has
            # been initialized by tw2.devtools.dev_server before we make demands of it.
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