CCC request to Update the OpenJDK Threeten Project in SE 8

JSR 310 has continued to refine and update the java.time API.
In addition to general javadoc improvements, the changes include:

java.time

* Duration - added a static from(temporalAmount) method to simplify conversions from other amounts
* Renamed the toString(Formatter) method to format(Formatter)
* Period - added a static from(temporalAmount) method to simplify conversions
* ZoneId -
   - Added getAvailableZoneIds method, a simpler mechanism than going to the provider
   - Added normalized() method to ease conversion to a fixed offset
   - renamed PRE and POST 2005 to SHORT_IDS

java.time.chrono

* ChronoLocalDate, ChronoLocalDateTime, ChonoZonedDateTime
   - changed xxx_COMPARATORs to static methods returning the Time Line Order comparators
   - Added a from(TemporalAcessor) method to ease conversions
* Chronology
    - Added method to create a Date from EpochDay (And in each calendar subclass)
    - Added resolveDate to allow resolving date components by the Chronology
    - Serialization fixes
    - Replaced raw return types with wildcard type
* Era
    - Removed factory methods and getChronology - they did not work correctly in all cases
    - Declared Era as a functional interface
* Hijrah calendar variations -
    - Supporting the Umm alQura calendar
* Added HijrahEra, IsoEra, JapaneseEra, MinguEra, ThaiBuddhistEra
    making the singletons public
* MinguoDate, ThaiBuddhistDate, HijrahDate - Added getEra method to return the concrete Era type.

java.time.format

* DateTimeFormatter -
    - Added fields for the predefined formatters (moved from DateTimeFormatters class)
    - Updated patterns to be CLDR compatible
    - Moved documentation for the pattern letters to the class javadoc
    - Added support for Zone default and conversion
* DateTimeFormatterBuilder
    - Updated documentation of patterns and corresponding equivalents to builder methods.
    - Added a method to append the localized offset.

java.time.temporal

* Adjusters - class removed; all static adjusters moved to static methods in TemporalAdjuster
* ChronoField -
    - Renamed EPOCH_MONTH to PROLEPTIC_MONTH
    - Added getDisplayName - for local specific field name
* Queries - class removed; all static query method moved to static methods in TemporalQuery
* TemporalField - added getDisplayName method
* UnsupportedTemporalTypeException - new subtype of DateTimeException to reflect no support for a unit or field
* WeekFields - Added fields for week and year of week-Based-Years to match CLDR fields "Y", "W"