Drop support for CLDR.js

 * JSHint: CLDR is no longer defined
 * `Ember.I18n.locale` no longer falls back to `CLDR.defaultLanguage`
 * `Ember.I18n.pluralForm` no longer defaults to `CLDR.pluralForm`
Merge pull request #164 from jamesarosen/james/no-cldr

Drop support for CLDR.js