Add an SSDT database project

:alarm_clock: :warning: **PLEASE READ** :warning: :alarm_clock: 

After this pull request is merged, you will need SQL Server Data Tools (SSDT) installed to open the database project.  SSDT is included by default in Visual Studio 2012, and is supported by Visual Studio 2010 *with SP1*; the latest version (December 2012 update) is available at http://msdn.microsoft.com/en-us/data/hh297027.

The SSDT project automatically deploys to a LocalDB database, so you will probably need SQL Server 2012 with LocalDB installed too. If you're using this project, you no longer need the .mdf and .ldf files that we've been sharing on Dropbox.

This is stage one of getting database deployments going.