Refactor asynchronous calls in the code to use async/await

[arthurTemporim]

[WIP]

This PR is about issue #47 .

• [x] refactor security.js
• [x] refacotr respond.js

To run hubot in docker I needed to uncomment mongo-init-replica in docker-compose.yml, tell me if it's wrong to do it.

In security.js the solution was simple, but in respond.js I need to create a new method, that I called getResult() to simplify the code.

I just ran manual tests.