Merge branch 'master' into data-reference

.dir-locals.el

circle.yml

docs/users-guide/10-metabot.md

frontend/src/metabase/auth/auth.js

frontend/src/metabase/lib/colors.js

frontend/src/metabase/pulse/components/PulseEditChannels.jsx

frontend/src/metabase/query_builder/QueryVisualization.jsx

frontend/src/metabase/query_builder/VisualizationError.jsx

.../src/metabase/query_builder/VisualizationErrorMessage.jsx

frontend/src/metabase/query_builder/VisualizationResult.jsx

frontend/src/metabase/visualizations/PieChart.jsx

project.clj

src/metabase/api/common/internal.clj

src/metabase/api/database.clj

src/metabase/api/session.clj

src/metabase/api/tiles.clj

src/metabase/cmd/load_from_h2.clj

src/metabase/driver.clj

src/metabase/driver/druid/query_processor.clj

src/metabase/driver/generic_sql.clj