Removed ArticleService.
Removed ArticlesController.
Removed the unnecessary members of IArticleService.
Removed ArticlesController acceptance tests.
Renamed NewArticleService to ArticleService.
Renamed NewArticlesControllerTest(acceptance test) to

ArticlesControllerTest.
Renamed NewArticlesController to ArticlesController.
Removed unnecessary constroctors of Article.
Simplified the Permissions enumeration and fixed urls of acceptance

tests.
Merge branch 'address-old-articles-controller'