Various test case conditions for the SQLServerAdapter

We finally got the adapter passing all the tests for rails3. Woot!
Would be nice to have these test case conditions make their way into the 3.0 release.

- Thanks,

I noticed the new test/cases/adapter/#{adapter_short} directory awhile ago which brings up a question. Should all the current_adapter? conditions be moved into their respective directories. If so I can submit a patch for that to clean things up. If that were the case, I would probably move my tests coercions back to the adapter so I could be in control over those a bit more. Thoughts?

- Ken