Create base JsonResponse and XmlResponse classes
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Key: LIBCLOUD-97
URL: https://issues.apache.org/jira/browse/LIBCLOUD-97
Project: Libcloud
Issue Type: Improvement
Components: Compute, Core
Reporter: Tomaz Muraus
Priority: Minor
https://github.com/apache/libcloud/pull/18/files#L0R15 this pattern repeats in
many drivers so we should add a base `JsonResponse` and `XmlResponse` classes
which drivers can use or inherit from.
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