Change the list policies interface to return a list of policies instead
Change mock model to return a list of policies rather than a dict, when listing
Fix cassandra model to return a list for policies
The API should not have to reformat a dict as a list now, just to linkify the list
Other changes to remove the assumption that policies is a dictionary
Finish changing instances of interface docstrings
Change schema so that the type is just policy, not a list of policies, thanks @manishtomar
Change some text docstrings, etc. to reflect that list policies returns a list now (thanks @manishtomar)
Merge pull request #401 from rackerlabs/change-list-policies-format-in-model

Change list policies format in model