Fixed the identifiers within the S3 JSON.
More of the S3 resources tests are passing, but this exposed several underlying bugs that need fixing, so these tests fail.

Things that need fixing:
* Collections need to post-process ``.get`` calls to return a Resource.
* Collections need to post-process ``.all`` calls to return a list of Resources.
* For some reason, the ``Body`` is missing from the data that comes back from ``S3ObjectCollection().get(…)``. This needs debugging...
Added post-processing of ``.get`` to Collections.