rmdir deletes non-empty prefixes and buckets

[ValentinBilla]

Reading the tests, this seems to be by design but the docstring in the method says the contrary which is aligned with Path.rmdir's behavior.

s3path/s3path/current_version.py

Lines 339 to 350 in cbc37d5

	def rmdir(self):
	"""
	Removes this Bucket / key prefix. The Bucket / key prefix must be empty
	"""
	self._absolute_path_validation()
	if self.is_file():
	raise NotADirectoryError()
	if not self.is_dir():
	raise FileNotFoundError()
	accessor.rmdir(self)

This might cause unintended deletion of existing files

Still the current behavior can be quite helpful in lots of cases and I wonder if maybe we could either add some kind of force: bool parameter to the function or creating a rmtree function akin to shutil.rmtree to ensure no mistakes are made and keep this great bit of functionnality

I'm available for contributions if any these changes were to be approved