To change default region from 'us-east-1' to 'custom'. Add a region value in your 'config.json'. "version": "2", "credentials": { "accessKeyId": "****************", "secretAccessKey": "***************", "region": "my-region" },
Support regions both 'us-east-1' and 'US' (short hand for US Standard) honored by S3.
Fixes #980