Skip entity auto-detection when explicitely passed

[yaneq]

The call to .first might cause an unnecessary db call

present SomeModel.active, with: Entities::SomeModel

__generated sql calls

Somemodel Load (1.0ms)  SELECT [...] ORDER BY id LIMIT 1
Somemodel Load (0.4ms)  SELECT [...] ORDER BY id

The first call is to determine the entity, which in this case is not necessary since it has been passed to present

[dblock]

Do you think you could write a spec for this? I imagine you could do something ensuring .first is not called. Also, please update CHANGELOG.

[dblock]

Merged squashed via 043b99f, thank you.