SAK-25778 added the isVisible attribute

git-svn-id: https://source.sakaiproject.org/svn/content/branches/SAK-25778@307346 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-25778 added entity feeds for user workspaces and myworkspace sites

git-svn-id: https://source.sakaiproject.org/svn/content/branches/SAK-25778@307347 66ffb92e-73f9-0310-93c1-f5514f145a0a