fixies for transaction manager

v2.2.0 changelog

fixing query inline varchar expression builder

Merge pull request #60 from StoiximanServices/schema_migrations

do not check for schema in migrations if prefix is empty

fixing issue #57

fixing issue with reversed uuid parts for uuids generated by Ecto.UUI…

…D module, such as case of :biniary_id primary keys

removing :command forom Tds.Result

excluding minor version for tds dependency

bumping tds version