Deleting row doesn't cause a pagination update

[fluffy88]

This is related to #304 but due to the age I'm opening a new issue.

Steps to reproduce
When using Backgrid with a Backbone.PageableCollection

1. Have a collection with multiple pages
2. Open the first page
3. Remove one row

Expected: A model from the next page get's pulled to the current page
Actual: The deleted model is removed leaving the current page 1 item short of the collections pageSize