Added more type metadata
Use tz-aware datetimes when setting created and modified.
Split views across multiple source files.
Split views across multiple source files.
Split out type metadata and resource lists in URLs.
Links now created in each direction, instead of having mess around with implicit inverted links.
Identifiers now preserved from raw_data['identifier'].
Removed unused import
Make handlers that mutate the database atomic (so we don't get weird inconsistencies)
Initial implementation of a GraphView for finding the transitive closure over a set of links.