fix(external-api): Avoid naming event 'error'

- EventEmmitter treats 'error' as a special case and throws error.

modules/API/API.js

      */
     notifyError(error: Object) {
         this._sendEvent({
-            name: 'error',
+            name: 'error-occurred',
             error
         });
     }

modules/API/external/external_api.js

     'device-list-changed': 'deviceListChanged',
     'display-name-change': 'displayNameChange',
     'email-change': 'emailChange',
-    'error': 'error',
+    'error-occurred': 'errorOccurred',
     'endpoint-text-message-received': 'endpointTextMessageReceived',
     'feedback-submitted': 'feedbackSubmitted',
     'feedback-prompt-displayed': 'feedbackPromptDisplayed',