File Support

When reading content from a repository, the response is:

 {'next': None,
 'previous': None,
 'results': [{'_href': 'http://f27-p3:8000/api/v3/content/file/44f4dfa2-1b80-459c-960b-079c4dd6e48c/',
              'artifacts': {'2.iso': 'http://f27-p3:8000/api/v3/artifacts/cbce4558-59b9-4674-83d2-7f6dd2875b6e/'},
              'digest': '3a1b7f18cb8e51f381a9ceb32447fcdaa070d41bbf2d9bd12f5ea1731dfe0b0b',
              'notes': {},
              'path': '2.iso',
              'type': 'file'}]}

</code>

"path" should be renamed to "relative_path" to better denote its purpose.