* Field config options: 'required' and 'pattern'
* Widget controls can implement it's own isValid
* Validation errors store in redux & displayed
* Support for returned Promises in isValid
* Allow widget controls to return either a boolean, an error object or a promise from isValid
* Add metadata to draft entry fields
* Do not render widget if value is null
* Pass along metadata
* Namespace queries to avoid conflict
* Query relational field on mount (for when editing entries)
* Make sure metadata is Immutable
* Added collection name as metadata keys
