if rename of file fails, the rename is undone in the view - #fix 2820

Changes:
 * OC.dialog -> OC.Notification
 * Added test
 * Fixed OC.Notification.show() issue for queued items
 * Highlight failed item and show notification
Merge pull request #3223 from owncloud/fix-2820

if rename of file fails, the rename is undone in the view - fix 2820