samvera / active_fedora / 4434

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main: 90%

Pull #1348

travis-ci

Implement enumeration for `Relation#each`

`Relation#each` had previously delegated to `Relation#to_a`, which sends
N requests to Fedora (plus one to Solr) and loads all the objects into memory
before beginning work.

This introduces an `Enumerator` based implementation, using `#find_each`. When
`#to_a` has already been called, we take advantage of the existing caching;
otherwise we yield items individually.

We also delegate certain other methods to `#each` instead of `#to_a`,
extending the same benefits to `#map` and `#collect`, and getting massively
better performance from `#blank?`, `#present?`, and `#any?`. There are probably
other optimizations to be explored based on this.

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