Implemented sequential task

BuildServer/lib/tasks/conditional.js

@@ -11,9 +11,7 @@ module.exports = function (params, processor) {
 				return processor.done();
 			}
 
-			processor.processTask(params.task, function () {
-				processor.done();
-			});
+			processor.processTask(params.task, processor.done.bind(processor));
 		}
 	};
 };

BuildServer/lib/tasks/sequential.js

@@ -0,0 +1,12 @@
+"use strict";
+
+var async = require("async");
+
+module.exports = function (params, processor) {
+	var mapper = Function.bind.bind(processor.processTask, processor);
+	return {
+		process: function () {
+			async.series(params.tasks.map(function (element) { return mapper(element); }), processor.done.bind(processor));
+		}
+	};
+};