* Updated Post Loop widget so it now accepts post__in in additional args field.
* Added update notification.
* Added filters for before and after the row content.
* Removed references to legacy widgets.

git-svn-id: https://plugins.svn.wordpress.org/siteorigin-panels/trunk@893023 b8457f37-d9ea-0310-8a92-e5e31aec5664