Added OdbcFreeTds datasource (Odbc) with tweaks for FreeTDS based on https://gist.github.com/shrimpwagon/5207702

We based this off of shrimpwagon's work: https://gist.github.com/shrimpwagon/5207702

It's probably alpha quality.  But, it works for what we need it to, and I think it's more complete then any other out there.