Add query params to link generation
Add support for query args in the mock request
Add decorator for processing pagination query arguments
Set default pagination limit, and also add InvalidQueryArgument to the errors list
Helper function for generating query args for pagination links
Make sure config data is always set back to {}, thanks @dreid
Merge pull request #391 from rackerlabs/paginate-list-groups-endpoint-part-1

Paginate list groups endpoint part 1