[FEATURE] Make index.html static again.
[FEATURE] Add deposit abstract function to bin/gateway.
[FEATURE] Create deposit abstract function.
[FEATURE] Simplifying outgoing payment worker.
[CHORE] Move test/make_payment to lib/send_payment.
[FEATURE] Move angular app to /app in node/express.
[FEATURE] Move angular app to /app in node/express.