Rearchitecture: Loon 2

[danReynolds]

Rearchitecture of core APIs as described in updated architecture doc.

• [Breaking] Default behavior of deleting a document/collection is to recursively delete all nested data.
• FilePersistor changes:
  • [Breaking] Change from getPersistenceKey to FilePersistor.key and FilePersistor.keyBuilder.
  • [Breaking] Changed the default data store location from loon.json to __store__.json.
  • [Feature] Added ability to specify the collections/documents to hydrate when calling Loon.hydrate().