Better async support

[YashdalfTheGray]

Closes #19

• Pulled in request-promise which is basically request (defacto node HTTP client) coupled with bluebird's promisifyAll
• Start using async/await in our code so it looks all synchronous because we're using Node 8
• If something goes wrong with the pug bomb, robotk will reply with the requested number of you dun goofed messages.