message: remove /activiti-app/ from JSON calls
diff: var returnType = ObjectNode;
  return this.apiClient.callApi(
  - '/activiti-app/app/rest/process-definitions/{processDefinitionId}/model-json', 'GET',
  + '/app/rest/process-definitions/{processDefinitionId}/model-json', 'GET',
  pathParams, queryParams, headerParams, formParams, postBody,
  authNames, contentTypes, accepts, returnType
  );
  var returnType = ObjectNode;
  return this.apiClient.callApi(
  - '/activiti-app/app/rest/process-instances/{processInstanceId}/model-json', 'GET',
  + '/app/rest/process-instances/{processInstanceId}/model-json', 'GET',
  pathParams, queryParams, headerParams, formParams, postBody,
  authNames, contentTypes, accepts, returnType
  );
  