[Dbix-class] Preliminary ADO support for DBIx::Class::Loader

[Brian Cassidy]

Hi All,

I've committed some code to support the usage of the ADO driver in
DBIx::Class::Loader. Some testing is in order -- particularly the
relationship loading.

Also, I've used PK::Auto::MSSQL to do primary key fetching, since you'd
likely be using some that understands @@IDENTITY with the ADO driver,
though, if someone can come up with a driver agnostic ADO-based solution,
I'd gladly use that instead.

-Brian Cassidy