localStorage cannot update multiple items at once

[JamesDonnelly]

The cache busting helper makes the following calls:

    window.api.json('totals'),
    window.api.json('icons/achievements'),
    window.api.json('icons/minions'),
    window.api.json('icons/mounts'),
    window.api.json('icons/emotes'),
    window.api.json('friends'),
    window.api.json('supporters'),
    window.api.json('translators')

As these APIs respond so quickly, the localStorage mechanism used to cache the data on the client cannot update quick enough, and ultimately only one item is cached at a time.

1. Clear localStorage.
2. Reload page.
3. Witness localStorage. -> totals.json cached, no others cached
4. Reload page.
5. Witness localStorage -> icons/achievements cached, totals already cached, no others cached.
6. Etc.