support ES6 with babel

[akvadrako]

Like a tape -r babel-register equivalent.

[ratiotile]

Not sure what you mean. Faucet should only process TAP output, so what does it have to do with es6? My script with es6 for reference: "test": "node_modules/tape/bin/tape -r babel-register 'src/stubs/setup_jsdom.js' 'src/**/test_*.@(js|es6|jsx)' | tee test.log | faucet"

[akvadrako]

faucet can also be used as a runner:

usage: `faucet [FILES]` or `| faucet`