Liquibase is a fantastic tool, but the quick-start guide on the website leaves something to be desired. At first glance, this looks like a rather better prospect for getting started with it.
It's fantastic and under utilized as are most tools like this in the database realm. Up until recently Liquibase was the baby of one guy. Last I recall he was hired by a company and allotted time to work on it as part of the new job. Maybe this will result in more robust official docs.