http: join repeated headers with a comma

Since Rack requires a Hash object, this is joined in in
accordance with rfc2616, section 4.2[1].  Of course, it's up to
the framework or application to handle such requests.

I could optimize this to avoid creating a single garbage
String object, but I don't think it's common enough to
worry about...

[1] - http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2

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