[threeten-dev] Public Eras changes

[roger riggs]

Hi,

Combining a number of issues related to  Eras:
   - The methods on Era that created a date based on the Era are
     problematic for the HijrahChronology were the Era was unaware
     of the variants.  The methods Era.date(y,m,d) and Era.dateYearDay(y,d)
     are removed.
  - The Era.getChronology method is no longer necessary and has the
     same problem for HijrahChronology of being unaware of the variants.
  - Issue#261 <https://github.com/ThreeTen/threeten/issues/261> proposed 
to expose the Eras as public enums and remove
    the public static fields from the Chronologies.
    (The JapaneseEra remains a class because of the unique need to be
    able to define new Eras from supplied configuration data).

Please review and comment:

Webrev:
    http://cr.openjdk.java.net/~rriggs/webrev-public-enum-eras/

Javadoc:
   http://cr.openjdk.java.net/~rriggs/javadoc-public-enum-eras/

-- 
Thanks, Roger

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