It is a little strange that this is uppercase even though it isn't a class. Also, it might be nice to keep the interface similar to the changes that have been introduced in Servo:

`ko.grid.columns.textColumn(...)` or `ko.grid.column('text', 'name', { options })`

I prefer the second as it is consistent with the Servo changes. It will also allow us to easily swap out column implementations globally and reduce the number of symbols that needs to exported.