The resource store is keeping track of _all_ middleware in all the NPM modules (well, those that are mojito bundles).   It might be nice to use the store to find these middleware, so that they don't necessarily have to be in the app themselves.  (An example might be a `search-mojito-contextualizer` which is a couple modules deep in the NPM hierarchy.  The user should still be able to specify `search-mojito-contextualizer` in the `middleware: [...]` in `application.json`.)