Merge pull request #1355 from ehartford/master

add AWSError to exports

Author: jeskew

lib/core.d.ts

@@ -17,4 +17,5 @@ export {HttpResponse} from './http_response';
 export {MetadataService} from './metadata_service';
 export {Request} from './request';
 export {Response} from './response';
-export {Service} from './service';
+export {Service} from './service';
+export {AWSError} from './error';