Added ability to pass an array of objects to the query builder.

Each object includes keys `field`, `value` and `operator` (optional). This adds the ability to build more complex queries using operators like `=`, `IN`, `<`, `>`, `<=`, `>=`, or `LIKE`.

Operators documented here: https://developer.intuit.com/docs/0100_accounting/0300_developer_guides/querying_data