Waiting on #44

Resolves #32

How to Test this PR

1. Install docker using this guide
2. Install docker-compose like this
3. In SCE-RPC directory, type sudo docker-compose up. This will create 3 containers for each RPC service.
4. Run sudo docker ps to get the container id of a running service
5. With a chosen id, do sudo docker inspect <id> to find the ip addres
6. Test that the client can talk to the container by adding a snippet of code to invoke the RPC.

For example in client/ledsign/led_sign_client.js

async function main() {
  await healthCheck('doodie', '172.18.0.4')
  .then(res => console.log('we got', res))
  .catch(err => console.log('nO!', err))
}

main()