getLocaleName does not return consistent results depending on the platform

getLocaleName does not return consistent results depending on the platform.

The documentation should be changed to state that it should return a BCP 47 representation of Unicode locale identifier (see http://www.unicode.org/reports/tr35/#Unicode_locale_identifier - section "3.3.1 BCP 47 tag conversion") to identify the culture of the user, and disambiguate the region as a place.

Implementation should be changed accordingly.

WindowsPhone 8 implementation is incorrect. Returning country code is not enough. It should use CultureInfo.CurrentCulture.Name.

Android and iOS should use "dashes" instead of "underscores".