A library for storing graph data in a Clojure map that automatically
normalizes nested data and allows querying via EQL.

Create a new db with `db`. db values are normal maps with a tabular structure.

Add new ones using `add`.

Entities are identified by the first key with the name "id", e.g.
:person/id. Adding data about the same entity will merge them together in
order of addition. To replace an entity, `dissoc` it first.

NOTE: Collections like vectors, sets and lists should not mix entities and
non-entities. Collections are recursively walked to find entities.

Query them w/ EQL using `pull`.

To get meta-information about what entities were added or queried, use the
`add-report` and `pull-report` functions.