delete_bucket does not remove from the list of buckets

[mkacherovich]

deteleBucket operation is currently broken because the deleted bucket will still be returned by subsequent listBuckets calls.

This is because file_store::delete_bucket() only modifies the @bucket_hash variable but not the @buckets variable.

[mkacherovich]

An update. I forked the repository and made this fix. I also implemented a feature that allows local store to be properly rescanned on every request, which makes Fake S3 useful for automation tasks that need to reset state.

The fork can be found here https://github.com/SwirlNetworks/fake-s3