Rather than embedding XML and JSON support within fog-core, this is the
start of extracting them to exist alongside core.
That will move the responsibility to each provider to declare if they want
XML or JSON services.
Goal being as we move towards a modular fog this allows providers to
require core and either JSON or XML gems and not pick up dependencies
only required by the other.
This reverts commits: 66638b25d7,
3f0314dbd1, and
18ce4b7eca.
Since google-api-client was added as a dependency in afa9b025e9,
multi_json is a de facto dependency of fog, so this is a needless layer.
If #1034 is still an issue, I'd be happy to ship a version of multi_json
that requires rubygems >= 1.3.5.
