Merge pull request #3693 from metabase/leaflet-maps

docs/users-guide/04-visualizing-results.md

frontend/src/metabase/admin/settings/selectors.js

frontend/src/metabase/dashboard/components/DashCard.jsx

frontend/src/metabase/dashboard/components/Dashboard.jsx

frontend/src/metabase/dashboard/components/DashboardGrid.jsx

frontend/src/metabase/dashboard/dashboard.js

frontend/src/metabase/lib/visualization_settings.js

frontend/src/metabase/query_builder/actions.js

.../metabase/query_builder/components/QueryVisualization.jsx

...tabase/query_builder/components/VisualizationSettings.jsx

frontend/src/metabase/query_builder/reducers.js

frontend/src/metabase/visualizations/PinMap.jsx

.../src/metabase/visualizations/components/ChartSettings.jsx

...end/src/metabase/visualizations/components/LeafletMap.jsx

...etabase/visualizations/components/LeafletMarkerPinMap.jsx

.../metabase/visualizations/components/LeafletTilePinMap.jsx

.../src/metabase/visualizations/components/Visualization.jsx

package.json

resources/frontend_client/index_template.html

src/metabase/public_settings.clj