[slightlyoff/ServiceWorker] Firefox buggy (#948)

Hey there!

My Firefox version 48 runs service workers. But, I've already noticed the Chrome sounds better.

Because Firefox just puts a new one cache version. And old cache versions are left. I can verify it by executing on console:

`caches.keys().then(function(cacheNames) { console.log(cacheNames) })`

They don't go away on Firefox. Even although Chrome works well.

And it's my activate event function below:

`self.addEventListener('activate', function(event) {`
`var cacheWhitelist = ['xxxxxxxx'];`
`  event.waitUntil(`
`    self.caches.keys().then(function(cacheNames) {`
`      return Promise.all(`
`        cacheNames.filter(function (cacheName) {`
`          return (cacheWhitelist.indexOf(cacheName) === -1);`
`        })`
`        .map(function (key) {`
`          return self.caches.delete(key);`
`        })`
`      );`
`    })`
`  );`
`});`

How could I make it works properly?
Thanks in advance.

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https://github.com/slightlyoff/ServiceWorker/issues/948