Merge branch 'release-0.15.0'

.gitignore

bin/version

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

docs/administration-guide/databases/bigquery.md

docs/administration-guide/images/bigquery_authcode.png

docs/administration-guide/images/bigquery_basic.png

docs/administration-guide/images/bigquery_clientdetails.png

docs/administration-guide/images/bigquery_clientid.png

docs/administration-guide/images/bigquery_copycode.png

docs/administration-guide/start.md

docs/operations-guide/running-metabase-on-cloud66.md

...operations-guide/running-metabase-on-elastic-beanstalk.md

docs/operations-guide/running-metabase-on-heroku.md

docs/operations-guide/start.md

docs/users-guide/03-asking-questions.md

docs/users-guide/05-sharing-answers.md

docs/users-guide/07-pulses.md

docs/users-guide/08-data-model-reference.md

docs/users-guide/09-multi-series-charting.md

docs/users-guide/images/MultiSeriesFinished.png