[REFACTOR] Renaming directories to follow Worthwhile conventions instead of Curate conventions
* consolidate models from app/repository_models into app/models
* rename app/repository_datastreams to app/datatsreams
* rename app/services to app/actors

Also, via updating worthwhile, refs #108 refs #63
Merge pull request #111 from curationexperts/rename_directories

[REFACTOR] Renaming directories to follow Worthwhile conventions instead of Curate conventions