fog/fog — pull request #1378 by carlallen (2012-12-13 22:22:30+00:00)
Title: Fog is set to require multi_json 1.0, which does not have dump/load methods

From ref https://github.com/intridea/multi_json/blob/v1.0.4/lib/multi_json.rb methods are later renamed and aliased from encode/decode to dump/load. If the gem restrictions are set loosely you must use the old method names.