Call ngModel.$setDirty() when deleting from array

- Closes #102

Author: qstrahl

dist/schema-form.js

@@ -1087,6 +1087,7 @@ angular.module('schemaForm').directive('sfArray', ['sfSelect', 'schemaForm', 'sf
             if (scope.validateArray) {
               scope.validateArray();
             }
+            ngModel.$setDirty();
             return list;
           };
 

src/directives/array.js

@@ -128,6 +128,7 @@ angular.module('schemaForm').directive('sfArray', ['sfSelect', 'schemaForm', 'sf
             if (scope.validateArray) {
               scope.validateArray();
             }
+            ngModel.$setDirty();
             return list;
           };