Repurpose babel npm package

[hzoo]

Update the babel npm package to do something again: Make it the default/opt-in/opinionated babel that Babel 5 was. It can default to using env and say the latest 2 browsers (without any config).

to combat the fatigue. We could even figure out how to do an "eject" feature that turns it into babel-cli + a .babelrc

[hzoo]

If/when we switch to @babel we can't use this. So if anything maybe create a babel-cli-env? Although you'd probably use babel-loader for browser code. For node maybe we just need to make babel-node/babel-register prod ready

[hzoo]

We can decide what to do without this issue 😄