Remove minor notifications; Close persistent notifications even on error

Closes #3105, Closes #3175

- Removed notification on successful post's `page` status change
- Removed notification on successful post `featured` status change
- Added `closePassive()` notifications on error in the post-settings-menu
- Persistent notifications will close whether their `DELETE` request was
  successful or not.

 #### Misc
- Added `name` attribute to `post-setting-menu.hbs` inputs to facilitate testing
- Removed `return <Promise>` from action in `PostSettingsMenuController`. Actions should only return `true`
- Toggling `post.featured` won't fire NProgress.
Merge pull request #3210 from novaugust/remove-minor-notifications

Remove minor notifications; Close persistent notifications even on error