Vue plugins are installed globally when applied with Vue.use()
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## Summary
In most of our apps, we first import `Vue` and then do `Vue.use()` to load plugins like `Translate`, `VueResource`, `VueRouter` and `Vuex`, and this happens before we even do `new Vue()` to create new Vue instance, so that ends up loading the plugin on Global Vue instance.
This was realized while discussing on our [Slack](https://gitlab.slack.com/archives/C0GQHHPGW/p1519720363000451) whether using `__()` & `s__()` in component templates is allowed without doing `Vue.use(Translate)` before-hand.
## Proposal
This issue is open to discussion with a goal to prevent doing `Vue.use` multiple times (while Vue is smart enough to install plugin only once even if `.use()` is called multiple times for same plugin).
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