Rename all angular-based feature specs for news items with "quick_"
Improve news item page

* Add classical implementation for taggings management using
	ViewingATaggableTaggings and AddingTaggings

* Add classical implementation for destroying the news item
Add missing tag :news to feature spec
Refactor news

* Separate api controller from interface controller
* Separate api routes from interface routes
* Cleanup routes
Add button to news item page from main list
Implement in-place editing of details on news item page

* For fields 'summary' and 'body'
* TODO: field 'language'
Improve news item page with live-editable details

* Displays live-editable fields: 'author' and 'language'
* Displays 'created at'
* Displays 'edited at' if the news has been edited