Follow common plugin pattern for vue-intl

[glen-84]

Vue.js plugins like router, store, and vuetify export a create{pluginName} function that itself returns the plugin instance.

For example, router has createRouter, etc.

Could the same be done for vue-intl, to keep things consistent?

I know that @formatjs/intl already uses the name createIntl, but that could probably be aliased.

Options are passed to the create method, not to Vue.use().

[longlho]

I'm not super well-versed in vue so this seems fine. Care to PR?

[glen-84]

Do we need to handle BC?

[longlho]

not really we can bump major

[glen-84]

Argh, I forgot that I'm unable to build or run the tests on Windows. (see here)

I just tried using npm 6.x, and that doesn't work either.

Has the build system been tested on Windows?

What do I do now? Send a PR without building/testing? Paste the code changes here? Give up? 🙂

[longlho]

Yeah you should send a PR regardless I'll check it out