Enhance error handling when publishing a HIT

[jorgeramirez]

Check the following errors so that we can send the corresponding error message to the frontend.

AccessDeniedException

{ AccessDeniedException: User: arn:aws:iam::637298523374:user/crowdai is not authorized to perform: mechanicalturk:CreateHIT
2018-04-06T17:42:14.849350+00:00 app[web.1]:     at Request.extractError (/app/node_modules/aws-sdk/lib/protocol/json.js:48:27)
2018-04-06T17:42:14.849352+00:00 app[web.1]:     at Request.callListeners (/app/node_modules/aws-sdk/lib/sequential_executor.js:105:20)
2018-04-06T17:42:14.849353+00:00 app[web.1]:     at Request.emit (/app/node_modules/aws-sdk/lib/sequential_executor.js:77:10)
2018-04-06T17:42:14.849356+00:00 app[web.1]:     at Request.emit (/app/node_modules/aws-sdk/lib/request.js:683:14)
2018-04-06T17:42:14.849357+00:00 app[web.1]:     at Request.transition (/app/node_modules/aws-sdk/lib/request.js:22:10)
2018-04-06T17:42:14.849359+00:00 app[web.1]:     at AcceptorStateMachine.runTo (/app/node_modules/aws-sdk/lib/state_machine.js:14:12)
2018-04-06T17:42:14.849361+00:00 app[web.1]:     at /app/node_modules/aws-sdk/lib/state_machine.js:26:10
2018-04-06T17:42:14.849362+00:00 app[web.1]:     at Request.<anonymous> (/app/node_modules/aws-sdk/lib/request.js:38:9)
2018-04-06T17:42:14.849364+00:00 app[web.1]:     at Request.<anonymous> (/app/node_modules/aws-sdk/lib/request.js:685:12)
2018-04-06T17:42:14.849366+00:00 app[web.1]:     at Request.callListeners (/app/node_modules/aws-sdk/lib/sequential_executor.js:115:18)
2018-04-06T17:42:14.849368+00:00 app[web.1]:   message: 'User: arn:aws:iam::637298523374:user/crowdai is not authorized to perform: mechanicalturk:CreateHIT',
2018-04-06T17:42:14.849370+00:00 app[web.1]:   code: 'AccessDeniedException',
2018-04-06T17:42:14.849372+00:00 app[web.1]:   time: 2018-04-06T17:42:14.845Z,
2018-04-06T17:42:14.849374+00:00 app[web.1]:   requestId: 'ac9b8278-9e99-4ded-96b5-98528c098810',
2018-04-06T17:42:14.849375+00:00 app[web.1]:   statusCode: 400,
2018-04-06T17:42:14.849377+00:00 app[web.1]:   retryable: false,
2018-04-06T17:42:14.849379+00:00 app[web.1]:   retryDelay: 52.280048917572095 }

RequestError

{ RequestError: To use the MTurk API, you will need an Amazon Web Services (AWS) Account. Your AWS account must be linked to your Amazon Mechanical Turk Account. Visit https://requester.mturk.com/developer to get started.
2018-04-06T18:53:58.182646+00:00 app[web.1]:     at Request.extractError (/app/node_modules/aws-sdk/lib/protocol/json.js:48:27)
2018-04-06T18:53:58.182648+00:00 app[web.1]:     at Request.callListeners (/app/node_modules/aws-sdk/lib/sequential_executor.js:105:20)
2018-04-06T18:53:58.182650+00:00 app[web.1]:     at Request.emit (/app/node_modules/aws-sdk/lib/sequential_executor.js:77:10)
2018-04-06T18:53:58.182652+00:00 app[web.1]:     at Request.emit (/app/node_modules/aws-sdk/lib/request.js:683:14)
2018-04-06T18:53:58.182654+00:00 app[web.1]:     at Request.transition (/app/node_modules/aws-sdk/lib/request.js:22:10)
2018-04-06T18:53:58.182655+00:00 app[web.1]:     at AcceptorStateMachine.runTo (/app/node_modules/aws-sdk/lib/state_machine.js:14:12)
2018-04-06T18:53:58.182657+00:00 app[web.1]:     at /app/node_modules/aws-sdk/lib/state_machine.js:26:10
2018-04-06T18:53:58.182659+00:00 app[web.1]:     at Request.<anonymous> (/app/node_modules/aws-sdk/lib/request.js:38:9)
2018-04-06T18:53:58.182661+00:00 app[web.1]:     at Request.<anonymous> (/app/node_modules/aws-sdk/lib/request.js:685:12)
2018-04-06T18:53:58.182663+00:00 app[web.1]:     at Request.callListeners (/app/node_modules/aws-sdk/lib/sequential_executor.js:115:18)
2018-04-06T18:53:58.182664+00:00 app[web.1]:   message: 'To use the MTurk API, you will need an Amazon Web Services (AWS) Account. Your AWS account must be linked to your Amazon Mechanical Turk Account. Visit https://requester.mturk.com/developer to get started.',
2018-04-06T18:53:58.182666+00:00 app[web.1]:   code: 'RequestError',
2018-04-06T18:53:58.182668+00:00 app[web.1]:   time: 2018-04-06T18:53:58.179Z,
2018-04-06T18:53:58.182670+00:00 app[web.1]:   requestId: '0d01847e-e886-4d

RequestError

{ RequestError: This Requester has insufficient funds in their account to complete this transaction. Please visit https://requester.mturk.com/prepayments/new to purchase Prepaid HITs. (1523041500385)
2018-04-06T19:05:00.367668+00:00 app[web.1]:     at Request.extractError (/app/node_modules/aws-sdk/lib/protocol/json.js:48:27)
2018-04-06T19:05:00.367670+00:00 app[web.1]:     at Request.callListeners (/app/node_modules/aws-sdk/lib/sequential_executor.js:105:20)
2018-04-06T19:05:00.367671+00:00 app[web.1]:     at Request.emit (/app/node_modules/aws-sdk/lib/sequential_executor.js:77:10)
2018-04-06T19:05:00.367673+00:00 app[web.1]:     at Request.emit (/app/node_modules/aws-sdk/lib/request.js:683:14)
2018-04-06T19:05:00.367675+00:00 app[web.1]:     at Request.transition (/app/node_modules/aws-sdk/lib/request.js:22:10)
2018-04-06T19:05:00.367677+00:00 app[web.1]:     at AcceptorStateMachine.runTo (/app/node_modules/aws-sdk/lib/state_machine.js:14:12)
2018-04-06T19:05:00.367679+00:00 app[web.1]:     at /app/node_modules/aws-sdk/lib/state_machine.js:26:10
2018-04-06T19:05:00.367680+00:00 app[web.1]:     at Request.<anonymous> (/app/node_modules/aws-sdk/lib/request.js:38:9)
2018-04-06T19:05:00.367682+00:00 app[web.1]:     at Request.<anonymous> (/app/node_modules/aws-sdk/lib/request.js:685:12)
2018-04-06T19:05:00.367684+00:00 app[web.1]:     at Request.callListeners (/app/node_modules/aws-sdk/lib/sequential_executor.js:115:18)
2018-04-06T19:05:00.367685+00:00 app[web.1]:   message: 'This Requester has insufficient funds in their account to complete this transaction. Please visit https://requester.mturk.com/prepayments/new to purchase Prepaid HITs. (1523041500385)',
2018-04-06T19:05:00.367687+00:00 app[web.1]:   code: 'RequestError',
2018-04-06T19:05:00.367689+00:00 app[web.1]:   time: 2018-04-06T19:05:00.366Z,
2018-04-06T19:05:00.367691+00:00 app[web.1]:   requestId: 'e32bd760-c71e-4e3b-9c20-04c18b68dfd4',
2018-04-06T19:05:00.367693+00:00 app[web.1]:   statusCode: 400,
2018-04-06T19:05:00.367694+00:00 app[web.1]:   retryable: false,
2018-04-06T19:05:00.367696+00:00 app[web.1]:   retryDelay: 58.36158143271288 }