[threeten-dev] Fixes for #171 and #175 in WeekDefinition

[Roger Riggs]

Updates for:

#174: WeekDefinition serialization invalid;
     fixed serialization;
#171: Consider adding US constant to WeekDefinition;
     added WeekDefinition.SUNDAY_START

See http://cr.openjdk.java.net/~rriggs/webrev-weekdef/

Comments?
-- 
Thanks, Roger

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