3 kind of integration tests:

• mutations/queries: to be done part of this task simplified the existing integration tests in the server as we don't have Postgres/nedb stuff anymore
• auth: to be done with AEROGEAR-8253
• subscriptions: to be done part of https://trello.com/c/Xl0rd1va/221-5-subscriptions-as-a-developer-i-want-data-to-be-synchronised-in-real-time-such-that-i-am-not-waiting-for-sync-frequency-loops-t