Make text unselectable if column is sortable (#104)
Make text unselectable if column is sortable (#104)

I find myself accidentally highlighting the table headers when clicking
to sort a column.

![](https://i.imgur.com/JjAmG0b.png)
offirgolan/ember-light-table,offirgolan/ember-light-table,bargar/ember-light-table,bargar/ember-light-table