Error message incorrect for global installation

[JemarJones]

The cli error message currently says the following:

You have mistakenly installed the `babel` package, which is a no-op in Babel 6.
Babel's CLI commands have been moved from the `babel` package to the `babel-cli` package.

    npm uninstall babel
    npm install babel-cli

See http://babeljs.io/docs/usage/cli/ for setup instructions.

But if someone installed the package globally, shouldn't it say:

You have mistakenly installed the `babel` package, which is a no-op in Babel 6.
Babel's CLI commands have been moved from the `babel` package to the `babel-cli` package.

    npm uninstall -g babel
    npm install -g babel-cli

See http://babeljs.io/docs/usage/cli/ for setup instructions.

Or perhaps if theres no way to detect how it was installed:

You have mistakenly installed the `babel` package, which is a no-op in Babel 6.
Babel's CLI commands have been moved from the `babel` package to the `babel-cli` package.

    npm uninstall [-g] babel
    npm install [-g] babel-cli

See http://babeljs.io/docs/usage/cli/ for setup instructions.

[babel-bot]

Hey @JemarJones! We really appreciate you taking the time to report an issue. The collaborators
on this project attempt to help as many people as possible, but we're a limited number of volunteers,
so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack
community that typically always has someone willing to help. You can sign-up here
for an invite.

[xtuc]

Thanks for the issue 👍. We can detect if Babel was installed globally.

Related #5091