Fix up single post routes.

No Issue
- Add local store lookup back to edit route.
- Prevent entry into route when an author is not the owner of a post
  even if model is passed in.
- Clean up references to pagination as there's no pagination going on.
Merge pull request #4501 from jaswilli/routes

Fix up single post routes.
Merge branch 'master' of https://github.com/TryGhost/Ghost
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