Sky Grid Columns created with ngFor do not update if model is updated

[Blackbaud-TrevorBurch]

Expected behavior

When creating sky-grid-column elements using an ngFor I would expect the available columns to update if the list of columns updates.

Actual behavior

If the available columns provided to the ngFor changes the sky-grid does not update to reflect these changes. This causes trying to populate a list of available columns using an HTTP call difficult as the grid does not update with the available columns once the HTTP data is returned.

Steps to reproduce

Create a sky grid and use an ngFor to create the sky-grid-column elements. Have the variable that the ngFor references start with some initial data. In some manner, change the data for this variable and notice that the sky-grid does not update with the new columns.

Plunker

https://plnkr.co/edit/Db0Ly9o3jhlMNlFGYNMG?p=preview

This Plunker shows the issue by showing that if you click the "Change columns" button the paragraph elements change but the sky-grid that references the same data does not change.

[Blackbaud-PatrickOFriel]

In 2.0.0-beta.8