[threeten-dev] DateTimeFormatters factory consolidation #210

[Roger Riggs]

Please review:

webrev:
     http://cr.openjdk.java.net/~rriggs/webrev-factory-210/

javadoc:
     http://cr.openjdk.java.net/~rriggs/javadoc-factory-210/

The factory methods are merged from DateTimeFormatters to DateTimeFormatter
and renamed as per conventions.

Thanks, Roger