Improve docs about broccoli-ember-i18n-precompile

[tdegrunt]

Did you take a look here?
Aside from that I use the following initialiser:

export default {
  name: "locale",
  //after: "store",

  initialize: function(container, application) {
    application.register('locale:main', application.locale, { instantiate: false, singleton: true });

    container.typeInjection('controller', 'locale', 'locale:main');
    container.typeInjection('route', 'locale', 'locale:main');
    container.typeInjection('component', 'locale', 'locale:main');
    container.typeInjection('model', 'locale', 'locale:main');

    Ember.Component.reopen(Ember.I18n.TranslateableAttributes);
    Ember.View.reopen(Ember.I18n.TranslateableAttributes);
  }
};

My application.locale is as follows:

import Locale from './utils/locale';
Locale.set();

.
.
.

var App = Ember.Application.extend({
  locale: Locale
});

Then lastly my utils/locale is as follows:

import Translations from 'boxture/translations';
import moment from 'boxture/utils/shims/moment';
//import numeral from 'boxture/utils/shims/numeral';

export default {
  default: 'en',
  current: null,
  set: function(app,locale) {
    // TODO or userLocale from localStorage
    locale = window.navigator.userLanguage || window.navigator.language;
    if (locale) {
      locale = locale.split('-')[0];
    }

    locale = locale || this.default;
    this.current = locale;

    moment.lang(locale);
//    numeral.language(locale);
//    CLDR.defaultLanguage = locale;

    this.setTranslations(locale);
  },
  setTranslations: function(locale) {
    Em.I18n.translations = Translations[locale];
  }
};

Now what is left out is how to load the JSON files into a hash you can actually use in the setTranslations (here it is Translations) but that should just be a little ajax.