Added support to call /task rollback:all and /task rollback:toversion /version X

Author: unknown

src/FluentMigrator.Console/TaskExecutor.cs

@@ -33,6 +33,12 @@ public void Execute(string task)
 						_steps = 1;
 					_migrationVersionRunner.Rollback(_steps);
 					break;
+            case "rollback:toversion":
+               _migrationVersionRunner.RollbackToVersion( _version );
+			      break;
+            case "rollback:all":
+               _migrationVersionRunner.RollbackToVersion(0);
+			      break;
 				case "migrate:down":
 					_migrationVersionRunner.MigrateDown(_version);
 					break;

src/FluentMigrator.Runner/MigrationVersionRunner.cs

@@ -17,6 +17,7 @@ public interface IMigrationVersionRunner
 		void MigrateUp();
 		void MigrateUp(long version);
 		void Rollback(int steps);
+	   void RollbackToVersion( long version );
 		void MigrateDown(long version);
 		void RemoveVersionTable();
 	}
@@ -171,8 +172,26 @@ public void Rollback(int steps)
 			_versionInfo = null;
 		}
 
+      public void RollbackToVersion(long version)
+      {
+         // Get the migrations between current and the to version
+         foreach (var migrationNumber in VersionInfo.AppliedMigrations())
+         {
+            if (version < migrationNumber || version == 0)
+            {
+               migrateDown(migrationNumber);
+            }
+         }
+
+         if (version == 0)
+            RemoveVersionTable();
+
+         _versionInfo = null;
+      }
+
 		public void MigrateDown(long version)
 		{
+
 			migrateDown(version);
 			_versionInfo = null;
 		}