preserve compatibility with python2.5 collections.MutableSet and collections.Iterable don't exist on this version of Python.
preserve compatibility with python2.5 collections.MutableSet and
collections.Iterable don't exist on this version of Python.

benoitc/couchdbkit,ghickman/couchdbkit,benoitc/couchdbkit,sirex/couchdbkit,ghickman/couchdbkit,sirex/couchdbkit,benoitc/couchdbkit,ghickman/couchdbkit