Merge branch 'master' into sample-dataset-metadata

docs/developers-guide.md

docs/metadata-guide.md

project.clj

...ient/app/admin/metadata/components/MetadataField.react.js

...ient/app/admin/metadata/components/MetadataTable.react.js

resources/frontend_client/app/css/admin.css

resources/frontend_client/app/css/core/colors.css

resources/frontend_client/app/lib/core.js

src/metabase/api/common.clj

src/metabase/api/session.clj

src/metabase/core.clj

src/metabase/task.clj

src/metabase/task/sync_databases.clj

test/metabase/api/session_test.clj

test/metabase/task_test.clj

test/metabase/test_setup.clj