recursiveDelete doesn't re-fetch container listings

[michielbdejong]

When you use recursiveDelete twice, it incorrectly uses the old container listings the second time.
For instance:

• create foo/bar
• recursiveDelete foo/ (correctly deletes foo/bar and then foo/)
• create foo/baz
• recursiveDelete foo/ (incorrectly tries to delete foo/bar and then foo/, instead of foo/baz and then foo/)

[bourgeoa]

resolved with PR #12