v0.3.0

• Updated functionality related to Soukai 0.3.0 release (relationships, engine interface).
• Replaced rdflib dependency with jsonld-streaming-parser, jsonld-streaming-serializer and n3.
• Added default export with loadSolidModels method to load models defined by soukai-solid.
• Added support for storing multiple models in a single document. Read the docs and see SolidModel.test.ts for examples.
• Added new SolidDocument model.
• Added helper methods to relation instances. Read the docs to learn more.

Breaking changes

• Refactored engine document format generated by SolidModel, they now generate JSON-LD graphs. Data stored with engines other than SolidEngine needs to be migrated in the upgrade. Read the docs for details.
• Some method signatures have changed in the SolidModel class. Check out those changes here.
• Extracted container functionality to SolidContainerModel.
• Made SolidModel class abstract (it should always have been).