Introduces the possibility to nest comments
Enables replying to a parent comment from the frontend
Renames poblicationResolver to publicationResolver
Moves the PublicationService and PublicationListener from GimmeBundle to NewscoopBundle
Implements the ArticleService and ArticleListener
Implements basic CommentListener
Changes to Core for the new CommentBundle
Committing this to ensure a stable dev env
Removes the CommentController from Core
Merge pull request #516 from terwey/CS-4780

Cs 4780
Removes duplicate getIssue()
Merge pull request #518 from terwey/patch-3

Removes duplicate getIssue()
resolve conflicts