Use collectionName for ModelStore key when modelName isn't set

[shebson]

When a model does not have a modelName and belongs to collection that is named, use the collectionName in place of the modelName when generating the ModelStore key.

Fixes #151. cc @lo1tuma

[spikebrehm]

Maybe we can find a less verbose name for this? Perhaps we could use resource instead of modelOrCollection?

[lo1tuma]

It actually describes exactly what the method does. I think the problem here is not the name but rather doing two things at once.

[shebson]

I absolutely agree that modelOrCollectionName is unwieldy. I chose it for consistency with modelOrCollection, a variable which is used in the fetcher and view engine, but I agree that resourceName is better.

I think that this is just a naming issue, though, and not a problem of trying to do two things in one method. This method takes a constructor and returns its underscorized id. I see that as one task with multiple applications.

[spikebrehm]

Thanks @shebson, this is an elegant way to solve this problem. The renaming to getModelOrCollectionName and associated variables seems a little unnecessary, or at least the name is very long. Something better?