Changes to Table Creation Scripts for SQL Server

1. Added unique indexes, constraints, and foreign key relationships to Ncqrs.Eventing.Storage.SQL.TableCreationScript.sql

2. Made the MyNotesEventStore.sql script (somewhat) match Ncqrs.Eventing.Storage.SQL.TableCreationScript.sql

3. Removed [dbo] schema references from MyNotesReadModel.sql so that the tables will be created in the default schema of the user running the script.