CS-5432: Adds method for only retrieving authors
CS-5432: Merges methods and adds parameter for users results
Merge remote-tracking branch 'rafal/sql-optimize' into CS-5432

Conflicts:
	newscoop/src/Newscoop/NewscoopBundle/Controller/AuthorsController.php
Merge pull request #2 from m038/CS-5432

Cs 5432