Closes#2860
- `editor-base-controller`'s `save` action returns a promise with the model
after saving
- `EditorNewController` will transition to `EditorEditController` upon a
successful save (model has an id)
- Removed a console.log in editor's save function
closes#2910
- create EditorController, PostSettingsMenuController
- remove `posts.post` controllerName dependency on EditorRoute/NewRoute
- `{{render}}` the PostSettingsMenuView with its own controller
- break up properties/methods from PostsPostController into all three controllers
- fix EditorRoute pagination options to now be comparable to PostsRoute
- add NewController to force NewRoute to refresh editor with blank model. Identical to Editor's
- EditorController and NewController are based on a shared mixin
- NewView created, templateName is 'editor'
