[ZF2-268] AmazonS3 service broken and other problems between Service\Amazon\S3\S3 and Http\Client
[ZF2-268] AmazonS3 service broken and other problems between
Service\Amazon\S3\S3 and Http\Client

http://framework.zend.com/issues/browse/ZF2-268


* substituted the $client->send()
* added appropriate ['Content-Type'] header
* fixed the call to the addSignature method
* substituted in the whole file the removed Request::getStatus() with
the new Request::getStatusCode()
* replaced in the whole file the removed Request::getHeader() method
with the Request->headers()->get()
* changed the static call to addSignature() into $this->addSignature(),
and changed its return value

This commit completely replaces pull #1173
https://github.com/zendframework/zf2/pull/1173

Change-Id: Ib576245d3ee0295dc24fca6bcd77f3737dd9354b

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