Use published version of swagger-node-runner

[penx]

Awaiting:

• [x] https://github.com/json-schema-faker/json-schema-faker/pull/360#issuecomment-364470410 release of json-schema-faker
• [x] apigee-127/sway#174 failing tests with [email protected]
• [x] apigee-127/sway#165 UNRESOLVABLE_REFERENCE for circular references
• [x] apigee-127/sway#168 Add date and time format support to mocks
• [x] apigee-127/sway#173 release of sway
• [x] theganyo/swagger-node-runner#119
• [x] theganyo/swagger-node-runner#121
• [ ] theganyo/swagger-node-runner#135
• [ ] theganyo/swagger-node-runner#136