Conflicts:
	frontend/src/query_builder/AggregationWidget.jsx

update a couple places where old card urls were being form in the backend

Make aggregation choices atomic

separate the functions for dealing with the AggregationClause into it's own object and write a bunch of unit tests for those functions.

Resolves #590

Load Google Maps & Google Fonts asynchronously 

Fix intermittent BigQuery test failures 

Set sslmode=disable explicitly for plain Postgres

Add :exclusions in project.clj 

Conflicts:
	resources/migrations/liquibase.json
	src/metabase/models/dashboard_card.clj

update the AggregationWidget so that the process of picking an aggregation is fully atomic.  this is specifically relevant to cases where a field needs to be chosen in addition to the aggregation operator.

shorten the TTL on the sql driver connection pools from 3 hours down to 1 hour.

Remove unused :requires 

Monthly pulses

More docstrings