Add reuse entries option

[dlitvakb]

Inspired by contentful/contentful.rb#164

[dborsatto]

How do you handle entries or assets built using different locales?

In the PHP SDK I use a similar mechanism where I keep objects in memory, but for entries and assets the cache keys contain the locale as well (it's something like Asset-5rk09fujeeoiw-en-US).

If I don't use the locale as part of the cache key I might end up with possible conflicts, due to assets/entries being fetched from the cache having a different locale (or no locale at all) from the one you're currently using. I suspect you might have the same issue here, but you probably can just solve it by changing cache_key in resource.py#45 🙂

[dlitvakb]

Hmm, this is interesting, I could make it locale aware. I'll take a look into it.