Migrate s3 publishing to ember publisher

This an ongoing effort to unify the s3 publishing of ember micro libs.  Since the environment variables are already set for the pre-existing s3 publishing grunt task, this should just work!  

The S3 Bucket urls that ember-publisher posts to for ember-data can be seen here in this test:

https://github.com/rondale-sc/ember-publisher/blob/master/tests/unit/ember-data-test.js#L9

And the function that generates those destinations can be found here:

https://github.com/rondale-sc/ember-publisher/blob/master/project_configs/ember-data-proj.js#L1

Let me know if you'd like to review this.  :))))