* Do not automatically kick off all jobs that yet have an entry in wh_etl_job_schedule table.
Instead simply schedule an entry and wait for its time to come.
* Make the ETL actor pool size configurable and set the default to something more conservative.
* Rename web to wherehows-api and update README.
* Rename backend-service to wherehows-backend
* Rename metadata-etl to wherehows-etl
* Rename hadoop-dataset-extractor-standalone to wherehows-hadoop