Downloaded the 3.0.0-RC2 zip distro and tried to generate an initial changelog from an existing database. Processes error'ed out: java.lang.ClassNotFoundException: org.yaml.snakeyaml.representer.Representer
Checked the liquibase.jar to see if maybe you guys had included the YAML library directly but didn't see it. Neither the RC1 nor the RC2 bundle contain a lib directory as looked for by the liquibase.sh script.