Delete localDB generated files and ignore

I guess these weren't intended to be in source control.

After this is included, you may see an error like
"Cannot attach the file '...ProductionSchedule\ProductionSchedule\App_Data\ProductionSchedule.Models.ProductionScheduleContext.mdf' 
when you run update-database again."

The fix is to open a connection to "(localdb)\v11.0" in Management Studio and delete database in there (it will produce error because file doesn't exist but it does the job). This should only be needed once.