Merge metabase master into fork

.circleci/config.yml

.github/PULL_REQUEST_TEMPLATE.md

.gitignore

Dockerfile

README.md

bin/build

bin/build-driver.sh

bin/build-drivers.sh

bin/docker/Dockerfile

bin/docker/run_metabase.sh

bin/reflection-linter

bin/remove-drivers.sh

bin/version

docs/administration-guide/01-managing-databases.md

docs/administration-guide/databases/cratedb.md

docs/administration-guide/databases/oracle.md

docs/administration-guide/databases/spark.md

docs/administration-guide/databases/vertica.md

docs/developers-guide.md

docs/faq.md