Display conditions - Added basic models

Display conditions - Added externally registerable condition operators
Display conditions - Added GreaterThan condition for testing

src/Artemis.Core/Models/Profile/Conditions/LayerConditionStatement.cs

@@ -0,0 +1,14 @@
+using System;
+using Artemis.Core.Models.Profile.Conditions.Abstract;
+
+namespace Artemis.Core.Models.Profile.Conditions
+{
+    public class LayerConditionStatement : LayerConditionPart
+    {
+        public Guid DataModelGuid { get; set; }
+        public string PropertyPath { get; set; }
+
+        public LayerConditionOperator Operator { get; set; }
+        public object Value { get; set; }
+    }
+}