[issue14674] Link to & explain deviations from RFC 4627 in json module docs

[Chris Rebert]

Chris Rebert <pybugs at rebertia.com> added the comment:

Hopefully final revision. Thanks for the quick response Éric!

Changes:
- Cover `ensure_ascii` parameter per latest review comment
- Add enhanced "Character Encodings" section for 2.x backport
-- Cover `encoding` parameter & restrictions
-- Cover non-implementation of encoding detection feature
- Hyperlink the JSON-RPC mention

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Added file: http://bugs.python.org/file25667/final-json.rst.patch

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