Merge pull request #893 from theodi/feature-bump-data-kitten

Bump data kitten
Add require: false for cucumber-rails
Use delayed_job to generate certificate
Move load_custom_survey to use across tests
Add generation result to dataset
Change request_dataset to cope with DelayedJob
Remove redundant save
Use newest_response_set to get ResponseSet
Check count of responses, rather than response_set's existence
Add test for pending creation
Fix api cukes
Fix user creation cukes
Add extra API cukes
Fix webmock stuff
Remove background job test

This is taken care of at a lower level
Merge branch 'feature-create-certificates-asynchronously' into staging
Return dataset URL
Add 202 response header
Merge branch 'feature-create-certificates-asynchronously' into staging