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New IO interface provided by castor/io

This is a backward incompatible release:

Changes

• The MNC\Http\Enconding\JsonReader interface has been removed. It did not do anything that the normal reading plus buffering could not do.
• The MNC\Http\Response::reasonPhrase method has been removed. Not it is implemented in MNC\Http\Status::reasonPhrase
• MNC\Http\Response is now an interface.

New Features

• Responses can implement MNC\Http\Redirected interface when a one or more redirects have been followed. A collection of MNC\Http\PartialResponse can be obtained from them with the headers and status of the previous redirects.

First version