Fix Issue#236: Can't Unsubscribe From Feed (Feed -> Unsubscribe). This feature was as yet unimplemented in Beta 3
Change behavior of Unsubscribe/Resubscribe

As proposed in pull request #237, unsubscribe/resubscribe of Open Reader feeds now only affects local level.
Merge pull request #237 from Echelon9/fix-issue-236

Fix Issue#236: Can't Unsubscribe From Feed (Feed -> Unsubscribe).
Merge pull request #240 from barijaona/fix-issue-236

Change behavior of Unsubscribe/Resubscribe