Added field_cover_image and field_file bases to osha module refs #2689
Renamed fields cover_image and file for osha_publication
Exported field_author on osha module
Renamed field_author for publication refs #2689
Renamed field_file and field_cover_image for case study module refs #2689
Renamed field_image and publication_date for news module
Renamed field_summary and field_image for blog module
Renamed field_summary and field_image and publication_date for news module
Merge pull request #99 from dragos-dumi/2689_rename_reuse_fields

2689 rename reuse fields