Update babel config instructions for Babel 6
Update babel config instructions for Babel 6

Fix https://github.com/webdriverio/webdriverio/issues/1485
Fix https://github.com/webdriverio/webdriverio/issues/1486

I have tested these settings with Mocha, though not with Jasmine.
monolithed/webdriverio,monolithed/webdriverio