Add support for Riak

I’ve looked a bit at some of the NoSQL databases and what it would take to support them with liquibase, but often times they do not have a JDBC interface and/or text-based DDL statements that be sent to them. 

If you are interested in support for Riak or other databases, the best approach would be to create an extension ( and if you find places in the liquibase codebase that need refactorign to support nosql databases submit a patch or let me know.


Please add support for Riak and similar database engines