incorporate test data #3
Description
Require datasources to provide clear information on the data that they produce. Currently all nodes used in the databox editor describe their inputs and outputs using json-schema, but it would be useful to present a set of data samples for developers to code against, for example if a developer is making use of the sensking kit accelerometer, they should be able to see representative data for various types of motion (walking, jumping up and down, shaking etc).