needed to add a quick fix on line 152 of FileSystemOperations (one of the deleteAll methods didn't use subdirectory in creating the path).

So.. in addition to that small fix I did a little cleanup:

1. added format to the "client" so that it didn't need to be redundantly passed all over the place
2. allowed for directories supplied by the formatter plugin to be null or empty strings in which case it wouldn't add a subdirectory to the path.
3. allowed for the formatter to also define the directory of metadata (previously hard-coded to "metadata"