allow setting multiple headers with the same name
authorMichael Wallner <mike@php.net>
Thu, 31 Mar 2016 13:12:19 +0000 (15:12 +0200)
committerMichael Wallner <mike@php.net>
Thu, 31 Mar 2016 13:12:19 +0000 (15:12 +0200)
Only http\Message::addHeader will transform the headers into a single
one where the values will be concatenated by comma.

Closes github issue #34


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