Work on populate group audience field.
Add og_group_ref field in biblio migrate.
Fix typo.
Merge pull request #4828 from openscholar/4827

4827
Fix the dupliacted publications menu item.
Merge branch '3215' of github.com:openscholar/openscholar into 3215
Make os_migrate_demo module compatible with migrate 2.6-rc1.
Merge pull request #4829 from openscholar/4827-fix_os_migrate

Make os_migrate_demo module compatible with migrate 2.6-rc1.
Add migrate of field_biblio_image
Divie the publication by the year of publications.
Add biblio_pdf field mapping.
CSS work.
Remvoe the CSS class.
Override the css.
Add field "biblio_extra" and handle migrate of the field.
Add complete() method to the migrate process.
Add og_vocabulary field to biblio migrate.
Fix comments.
Merge pull request #4834 from openscholar/4827-field_image

Add migrate of fields from the node to the new Biblio entity
Remove old file.