Saving to/hydrating from the browser cache

[okbytes]

I didn't realize when first implementing this package that the cache is in memory. Thus, all the icons used in our app need to be freshly downloaded when it's a new session or a page refresh. We're a single page app, so this happens quite a lot.

I'm not sure how the browser cache works and what something like this would look like. Any tips/experiences welcome. :-)

Thoughts?

[gilbarbara]

Hey @okbytes

Multiple instances cache and browser permanent cache added in v4.x