StatusPageAPI doesn't handle `error` events

[jutaz]

StatusPageAPI class' methods create StatusPageRequest, which emits error events, but those aren't handled in class' methods.

This leads to a problem if statuspage API is unreachable (or any other error in TCP stack), which happened just last week - since error event isn't handled, it's propagated to the topmost process' scope. This leaves clients with 2 possibilities - handle error via process.on('unhandledException', () => {}) or crash.

In some (maybe most) cases handling such exceptions via process.on('unhandledException', () => {}) is undesirable due to difficulty of understanding where the error originated from etc.

There is a possibility to handle such errors with (now deprecated) domain package module internally, but given it's depreciation - it's not a great option either.

How to reproduce

const StatusPage = require('statuspage-api'),
      api = new StatusPage({
        pageid: 'id',
        apikey: 'key',
        host: 'someNonReachableHost.tld'
      });

api.get('components', (result) => {
  // Will never get called - global exception will occur.
});

I'm happy to submit a patch to this.