Add "Unsubscribe" menu item.

Signed-off-by: Arthaey <arthaey@gmail.com>
Sort feeds manually, because the API isn't sorting correctly?
Revert 'Add "Unsubscribe" menu item.'

This reverts commit a5c9c3c47ef842784519745c4d1d3620c9eaf23d.
Merge pull request #14 from Arthaey/sort-by-updated-time

Sort by updated time