[FEATURE] Add a convienent method for retrieving CldrModel

This adds a method that allows one to conveniently retrieve
the appropriate CldrModel from a Locale. One now must not
inject the LocalitationService additionaly just to retrieve
the currently required Locale.

For working with the currently active Locale's CLDR model,
the following approach is now possible::

 $this->localizationService
 	->getConfiguration()
 	->getCurrentLocale()
 	->getCldrModel();

Change-Id: I3d31e116ebc0548dfedffeb90ff8f939fae2f8ce
Releases: master