Make loading of common locale optional

[MikeMcElroy]

It shouldn't be required that the package go out to a third-party CDN. It'd be nice to be able to specify the COMMON_LOCALE_DATA_URLS or be able to bundle an entire locale package in with the initialization. Something like:

intl.init({
  currentLocale: 'en-US',
  locales: {
    'en-US': { ... }
  },
  localeUrls: {
    'en-US': 'https://nonexistentUrl.cdn.com/localedata/en-us.json'
  },
  localeData: {
    'en-US': { ... }
  }
})

[cwtuan]

Released in https://github.com/alibaba/react-intl-universal/releases/tag/1.12.0.