Change `makeFindAll` so `models` won't lock up the client
Avoid slow join-model initialization

* It's no longer necessary and substantially speeds up model
  initialization of heavily-linked instances (>30% in some cases)
Avoid unnecessary refresh in `mapping_count`

* RefreshQueue reloads only if not present -- `findOne` and/or
  individual `refresh` is unneeded
Merge pull request #484 from reciprocity/feature/performance-tweaks

3 minor but effective performance changes