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@mappum, could you CR this and let me know if I've interpreted the
desired behavior correctly?

we've gotta allow the code to speak for itself. I wouldn't have been
able to safely modify this code without having my hand held. I am but a
lowly programmer with a simple mind.

cc @jbenet @whyrusleeping @mappum

commands/http: Don't set Content-Type for stream outputs so browsers can MIME-sniff the actual content type

commands: Ensure argument parsing maintains total argument count, so that argument validation will fail if there are too many

commands: Return a reader in a Response#Reader method, instead of making Response implementing io.Reader