[threeten-dev] Request for review: quarter text support

[Masayoshi Okutsu]

I've added quarter text support. Actual names are supported in English 
only under the default locale data provider. You can specify 
-Djava.locale.provider=CLDR if localized names are required. I will add 
localized names into the existing JRE resources (as separate resource 
bundles) later if I have time.

Also:

- changed DateTimeFormatterBuilder.getLocalizedName to 
DateTimeTextProvider.getLocalizedResource (package private).

- changed TestTextParser/Printer to specify Locale.ROOT for string case 
conversions in order to avoid any surprises with the Turkish locale.

- the "MonthNarrow" to "MonthNarrows" change in CLDRConverter.java is a 
piggy back fix.

Webrev:
http://cr.openjdk.java.net/~okutsu/310/quartertext/webrev.01/

Thanks,
Masayoshi