Merge pull request #28 from cstavr/feature-unicode-handling
This patch-set fixes a number of issues relative with handling unicode strings. These commits try to avoid mixing bytestrings and unicode objects, by decoding bytestrings as early as possible (Input) and encoding unicodes as late as possible (Ouput). In the API the encoding that is used is always 'UTF-8'. In the CLI the encoding that is used is the user's preferred encoding. Besides unicode issues, this patch-set fixes handling of image metadata (Plankton) which are views as HTTP headers. Since, image metadata must be valid HTTP headers, metadata keys and values which contain user defined values must be properly quoted and unquoted where needed.
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