Get SQL Server working with ASP.NET tests on Windows

With @pdonald's advising, I got the SQL Server stuff done. I've never tested this on Amazon EC2, but I think it'll probably work.

Follow the instructions in `README.md` to setup the SQL Server box, then use `run-tests.py -d` to point to it for `aspnet-sqlserver-raw` and `aspnet-sqlserver-entityframework`.

CC: @bhauer