Fix bug caused by execute returning an array of hashes instead of an array of arrays.
Maybe DB Engine dependent? I'm using Postgres.
Default to original method when fuzzy_paginate is not enabled.
Instead of emulating an old activeadmin method which had at least one bug for the counting,
just call the original function if we don't ask to fuzzy_paginate.
Change activeadmin dependencies to allow 1.0.0 and higher