Json Iterator Go Versions Save

• Fixed json iter doesn't work properly with nil RawMessage #469
• Fixed null in number json tag string (#480)
• Fixed errors during reading integers from chunked io.Reader #477
• Fixed nil pointer panic when Unmarshal with a empty file #508
• Fixed [float string]different result vs origin after call Marshal & Unmarshal #510

• Fix #459 map keys of custom types should serialize using MarshalText when available
• Fix potential panic in (*stringAny).ToInt64 and (*stringAny).ToUint64(see #450)
• Fix #449 do NOT marshal the field whose name start with underscore
• Reuse stream buffer and remove flush in (*Stream).WriteMore(see #441 #440)
• Fix #421 simplify the error string returned by the decoder when it meets error unmarshaling anonymous structs
• Fix #389 #411 do NOT marshal the json.RawMessage type field whose real type is integer/float as "null" with ValidateJsonRawMessage option enabled
• Fix #326 do Not marshal private field after calling extra.SetNamingStrategy() to register naming strategy extension

• fix #311 handle nil any
• fix #313 support json marshaller type as map key
• fix #308 do NOT skip embedded structs without tag when OnlyTaggedField
• fix #317, try parse as BigFloat if overflow
• Fix trailing newline

fix #293 copy extensions fix #286 calcHash should use byte not rune to calc hash fix #291 omit empty was not handled properly for json raw message fix #295 decoder more was not compatible with standard library