Fix duplicated date when importing news via RSS.
Merge branch 'SCHOLAR-3.x' into 6079
Fix missing image in feed import.
Add update function.
Remove function.
Merge branch 'SCHOLAR-3.x' into 6079
Merge branch '6079' of github.com:openscholar/openscholar into 6079
Merge pull request #6177 from openscholar/6079

Fix duplicated date when importing news via RSS.