refs #2686 - contrib module used for free text search in multiple fields
refs #2686 - Alter Newsletter creation view from scs contrib module - add filters, add extra columns, display specified content types
refs #2686 - enable osha_newsletter custom module (and deps)
refs #2686 - refactor code
Merge pull request #108 from claudiaifrim/ticket_2686

Ticket 2686 - alter Newsletter creation view - from scs contrib module - add filters and extra columns, display only the required content types