Hide non default segments on some pages

- added getPublic() method on Segment model
- filter out dynamic lists from add/move/remove segment in subscribers

assets/js/src/subscribers/list.jsx

@@ -103,7 +103,9 @@ const bulk_actions = [
         id: 'move_to_segment',
         endpoint: 'segments',
         filter: function(segment) {
-          return !!(!segment.deleted_at);
+          return !!(
+            !segment.deleted_at && segment.type === 'default'
+          );
         }
       };
 
@@ -132,7 +134,9 @@ const bulk_actions = [
         id: 'add_to_segment',
         endpoint: 'segments',
         filter: function(segment) {
-          return !!(!segment.deleted_at);
+          return !!(
+            !segment.deleted_at && segment.type === 'default'
+          );
         }
       };
 
@@ -159,7 +163,12 @@ const bulk_actions = [
     onSelect: function() {
       let field = {
         id: 'remove_from_segment',
-        endpoint: 'segments'
+        endpoint: 'segments',
+        filter: function(segment) {
+          return !!(
+            segment.type === 'default'
+          );
+        }
       };
 
       return (