Added support for Vertica JDBC driver

Regenerated docs to include vertica

Forgot to import vertica into test

Had incorrect driver name

Looks like double-quotes are needed as delim
Merge pull request #214 from cbenning/vertica-support

Added support for Vertica JDBC driver
Remove unused let binding
Rename with-now and with-later
Add one-to-one foreign keys to dry run results
Fetch one-to-one relation separately when transform fn is defined