Testing & continuous integration setup

[metasoarous]

Methinks via midje and CircleCI; Haven't worked with CI so much yet, so would be good if someone who has could help with that. For the testing side, I think something along the lines of https://www.youtube.com/watch?v=M1Tl-YLqkQc, where we focus on testing the data flow via subscriptions and events is the key. This should let us do simulation testing of various invarients (perhaps in our case ensuring that valid transactions make it round the loop).