Add werkzeug and flask to intersphinx mapping.
Add content-negotiation docs.
Added graph depicting content negotiation.
Unhandled exceptions moved outside of graph.
Made a note to remove global (pluggable renderers).
Updated content-negotiation docs.
Added status code parameter to serialize_response et al.
Strip blueprint prefix from endpoint names when content-negotiating.
Added mimemap decorators.
Note about endpoint names.
Renamed decorators.
Added note about vnd.-mimetypes.
Add copy() method; do not use global renderer instances.
Note about ResourceMountMixin.
Renamed encoding module to json.
Removed HTTPError mixin.
Added to_dict() supporting mixin.
Renamed RESTJSONEncoder to ExtendedJSONEncoder.
Reorganized docs.
JSON rendering updated.