Request: Support babel 7

[FreekVR]

Vueify doesn't currently work correctly with babel@7, which is now stable: https://babeljs.io/blog/2018/08/27/7.0.0

There are a couple of issues already in the tracker, but I think the most important thing would be to update the vueify internals to use babel7:

• ParseError: 'import' and 'export' may only appear at the top level #228
• babel in vues #171

It'd be nice if the project works under babel7, especially since it contains many optimized patterns (for example better support for browserlists) and allows for a smaller babel-polyfill footprint (if used)

[martin-badin]

something new?