* Get stats from clickhosue
* Pull stats from clickhouse
* Use correct Query namespace
* Use Clickhouse in unit tests
* Use Clickhouse in stats controller tests
* Use fixtures for unit tests
* Add Clickhouse to travis
* Use Clickhouse session store for sessions
* Add garbage collection to session store
* Reload session state from Clickhouse on server restart
* Query from sessions table
* Trap exits in event write buffer
* Run hydration without starting the whole app
* Make session length 30 minutes
* Revert changes to fingerprint schema
* Remove clickhouse from fingerprint sessions
* Flush buffers before shutdown
* Use old stats when merging
* Remove old session schema
* Fix tests with CH sessions
* Add has_pageviews? to Stats