Update default and --minimal app skeletons. Fixes #9961

[robfallows]

Rename test/ folder to tests/

Removing the 1.7 meteor stanza from package.json should restore legacy eager loading with imports/ behaviour, but the presence of the test/ folder, which now becomes eagerly loaded breaks the build.

The Meteor Guide recommends the use of a tests/ folder. This PR renames test/ to tests/ and updates the package.json accordingly for the default app (including the --minimal version).

Test

Using Meteor 1.7+

meteor create my-app (or meteor create my-app --minimal`)
cd my-app

Edit package.json and remove the entire meteor stanza. Then

meteor npm i
meteor

The app should start without errors.

[benjamn]

Thanks @robfallows!