Category Pages support- prototype

- loading category pages as a normal articles
- below article- list of its member pages
- searching category member pages
- animations (load more, searching) 
Prototype- needs opinions.
You shouldn't be setting state in the model to do this. Model should encapsulate server data model state, additional state that is a combination of model state, or used for presentation should be encapsulated in an Ember Controller. But regardless of that, by using state to handle error response, you're not using Ember's native error management.

You should remove `membersNotFound` and simply `reject` the promise with a relevant reason. Then you can use the route's `error` action or to transition to an error page with the properly supplied message.