Provide Liquibase -> Commons Logging adapter

Add `CommonsLoggingLiquibaseLogger` implementation to adapt Liquibase's
`Logger` to Apache Commons Logging.

The `LiquibaseAutoConfiguration` class has also been updated to
automatically use the adapter

Fixes gh-1840
Merge pull request #1840 from BigMichi1/master

* pull1840:
  Provide Liquibase -> Commons Logging adapter