noosfero | Fix rails 4 caching expiration (#791)

[Antonio Terceiro]

New comment for Merge Request 791

https://gitlab.com/noosfero/noosfero/merge_requests/791#note_3784480


Antonio Terceiro

I'm not sure about this. What I understand from the [documentation for #cache](http://apidock.com/rails/ActionView/Helpers/CacheHelper/cache) is that this should only make a difference when in development mode ...

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