Migrate to 28.io

- fixes running all grunt tasks locally and against any backend
- automatic deployment of master to bucket secxbrl.28.io and S3 bucket secxbrl
- documentation of tasks and better error messages
a redeploy is a deployment of a project without delete and create. Just overwriting the files on s3 and on 28.io. I can rename it to --nodelete or something else to make it clearer?