Set `paging` on record arrays from response' `meta`
Record array should call parent\ willDestroy
BD.deleteRecords should return event target for empty arrays
Destroy has-many record arrays when unloading parent\nThis fixes a problem with BD.store.reset when being called after a parent has been deleted but its children array is still alive and referencing the now destroyed parent
Merge pull request #35 from billysbilling/array-paging

Set `paging` on record arrays from response' `meta`