- Adds isNumberGeographical() method.
- Adds getRegionCodesForCountryCode() method.
- Fixing issue with getSupportedGlobalNetworkCallingCodes()
- [http://code.google.com/p/libphonenumber/issues/detail?id=202]
+ [https://github.com/googlei18n/libphonenumber/issues/202]
- Ensures that returned collections are unmodifiable where necessary
[there is a very slight risk that this may break existing users who were relying on being able
to modify these collections, but doing so would be breaking lots of other assumptions that this