When trying to pop/apply a stash specified with an argument
containing IFS whitespace, git-stash will throw an error:

    $ git stash pop 'stash@{two hours ago}'
    Too many revisions specified: stash@{two hours ago}

This happens because word splitting is used to count non-option
arguments. Make use of rev-parse's --sq option to quote the arguments
for us to ensure a correct count. Add quotes where necessary.

Also add a test that verifies correct behaviour.
Helped-by: NThomas Rast <tr@thomasrast.ch>
Signed-off-by: NØystein Walle <oystwa@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>