Fix bugs when handling string keys
Factor out default logger in configuration spec
Update spec to use ActiveSupport::Logger to support Rails 4
Use Enumerable to test if returned object is collection

Rails 4 (actually ActiveResource 4, since it is now spun off from Rails)
now returns an ActiveResource::Collection object instead of an Array for
calls returning multiple records. This fix should work for both version 4
and earlier versions of ActiveResource.
Fix logger spec to be compatible with ActiveSupport 4.0
Merge pull request #9 from ianejames/string_keys

Fix bugs when handling string keys
Merge pull request #10 from ianejames/spec_updates

Update specs to better support Logger variations

* Check that we have at least an enumerable instead of an array for collection synchronization