Allow user to add new RSS feeds

In 5.x the mYsite module allowed users to add a new RSS feed (even if site admin may not have pre-configured it). They way it worked is user added new RSS feeds but they were not enabled till admin configures those and make available. That way siteadmin can make sure those are right. But atleast this way the admin would know which feeds are in demand from userbase and the same time those are kept seperate to monitor performance etc.