added -D option to allow for old style connection strings

[bunnylushington]

Hi! I like your client but need Windows domain authentication to connect in my environment. I've hacked in a (working! and ugly!) option to allow classic style DSN strings on the command line (at the expense of ignoring all the other options). I'm sending along my changes but understand this is maybe not the direction you want to go. Thanks!

[lemex92]

+1 This would be useful. Updating the version broke all our commands!

[hasankhan]

Please write tests and make sure build passes with jshint.

Thanks