rollback the upgrade by using dbmigrator update("0") fails
----------------------------------------------------------

                 Key: DNET-687
                 URL: http://tracker.firebirdsql.org/browse/DNET-687
             Project: .NET Data provider
          Issue Type: Bug
          Components: Entity Framework support
    Affects Versions: 5.0.5.0
         Environment: windows 7 / firebird 2.5.2 / ef 6.1.3
            Reporter: Leonard Wennekers
            Assignee: Jiri Cincura


The following exception occurred:

Test 
'IOLAN.Context.Migration.UnitTests.UnitTestContextManagerFirebird.TestContextMigration'
 failed: System.InvalidCastException : Can't convert typee 
System.Data.Entity.Migrations.Model.DropTableOperation to 
System.Data.Entity.Migrations.Model.HistoryOperation.
        bij 
FirebirdSql.Data.EntityFramework6.FbMigrationSqlGenerator.Generate(IEnumerable`1
 migrationOperations, String providerManifestToken)
        bij System.Data.Entity.Migrations.DbMigrator.ExecuteOperations(String 
migrationId, VersionedModel targetModel, IEnumerable`1 operations, 
IEnumerable`1 systemOperations, Boolean downgrading, Boolean auto)
        bij System.Data.Entity.Migrations.DbMigrator.RevertMigration(String 
migrationId, DbMigration migration, XDocument targetModel)
        bij 
System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.RevertMigration(String
 migrationId, DbMigration migration, XDocument targetModel)
        bij System.Data.Entity.Migrations.DbMigrator.Downgrade(IEnumerable`1 
pendingMigrations)
        bij 
System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.Downgrade(IEnumerable`1
 pendingMigrations)
        bij System.Data.Entity.Migrations.DbMigrator.UpdateInternal(String 
targetMigration)
        bij 
System.Data.Entity.Migrations.DbMigrator.EnsureDatabaseExists(Action 
mustSucceedToKeepDatabase)
        bij System.Data.Entity.Migrations.DbMigrator.Update(String 
targetMigration)

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