Remove timeframe from strategy (#13)

src/Managing.Domain/Scenarios/Scenario.cs

@@ -4,17 +4,20 @@ namespace Managing.Domain.Scenarios
 {
     public class Scenario
     {
-        public Scenario(string name)
+        public Scenario(string name, int? loopbackPeriod = 1)
         {
             Name = name;
             Strategies = new List<Strategy>();
+            LoopbackPeriod = loopbackPeriod;
         }
 
         public string Name { get; set; }
         public List<Strategy> Strategies { get; set; }
+        public int? LoopbackPeriod { get; set; }
+
         public void AddStrategy(Strategy strategy)
         {
             Strategies.Add(strategy);
         }
     }
-}
+}