rework updater to use github tarballs; add some additional logging and prevent old directory being renamed pointlessly in a few cases (closes #559)
rework updater to use github tarballs; add some additional logging and
prevent old directory being renamed pointlessly in a few cases
(closes #559)

shakaran/Big-Big-RSS,shakaran/Big-Big-RSS,shakaran/Big-Big-RSS,shakaran/Big-Big-RSS,shakaran/Big-Big-RSS