Merge branch 'fkcascade' of https://github.com/sonix1977nl/fluent-nhibernate into sonix1977nl-fkcascade

Author: jagregory

src/FluentNHibernate/Conventions/Instances/IKeyInstance.cs

@@ -9,5 +9,6 @@ public interface IKeyInstance : IKeyInspector
         new void ForeignKey(string constraint);
         new void PropertyRef(string property);
         new IEnumerable<IColumnInspector> Columns { get; }
+        void CascadeOnDelete();
     }
 }

src/FluentNHibernate/Conventions/Instances/KeyInstance.cs

@@ -51,5 +51,10 @@ public void Column(string columnName)
                     .Cast<IColumnInstance>();
             }
         }
+
+        public void CascadeOnDelete()
+        {
+            mapping.OnDelete = "cascade";
+        }
     }
 }