This fixes #57 by hydrating resources from a collection with a JMESPath
query that is at `collection.resource.path` instead of `collection.path`
in the resource model.

```python
import boto3

for o in boto3.resource('s3').Bucket('boto3').objects.all():
    # `o.meta.data` is set now, so the following succeeds.
    print(o.size)
```