stub test for magit-get-next-tag

Signed-off-by: Loic Dachary <loic@dachary.org>
Merge pull request #1340 from dachary/wip-test

stub test for magit-get-next-tag
magit-show: bugfix

`magit-diff-range' returns a cons cell of atoms.
magit-key-mode-popup-logging: support --no-merges option
Merge pull request #1341 from mgalgs/no-merges

magit-key-mode-popup-logging: support --no-merges option
magit-revert-buffer-hook: run in magit-revert-buffers
Merge remote-tracking branch 'origin/master'
magit-process-quote-arguments: flatten list of arguments