v0.0.4

• Queries that attempt to compare a column to a column in the query root table, or a related table, will now fail instead of giving the incorrect result (#22)
• Fix bug in v2 to v3 conversion of query responses containing nested objects (PR #27)
• Fixed bug where use of aggregate functions in queries would fail (#26)
• Rename Any type to ExtendedJSON to make its representation clearer (#30)
• The collection primary key _id property now has a unique constraint generated in the NDC schema for it (#32)