addRecord is unable to insert values for primary key column on MS SQL Server

If a migration contains an addRecord method that specifies a value for the table primary key on a SQL Server table the migration will fail.

To allow this the SQL statement has to be prefixed with the following code:

```
-- SET IDENTITY_INSERT to ON.
SET IDENTITY_INSERT dbo.Tool ON
GO
```

For more information see http://msdn.microsoft.com/en-us/library/ms188059.aspx 
